91 results on '"Yong Sheng Zhao"'
Search Results
2. Realization of Single-Crystal Dye Lasers by Taming Charge Transfer in Molecular Self-Assemblies
- Author
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Wanting Dong, Chunhuan Zhang, Haiyun Dong, Zhonghao Zhou, Jiannian Yao, and Yong Sheng Zhao
- Subjects
General Engineering ,General Physics and Astronomy ,General Materials Science - Abstract
The large library of organic dye molecules offers almost infinite possibilities for laser design, but still faces a great challenge in achieving pure dye aggregate lasers due to intermolecular quenching. Here, we report a kinetically controlled molecular self-assembly strategy to synthesize unconventional dye microcrystals for lasing. By increasing temperature, the dye self-assembly is transformed from thermodynamic to kinetic control. Unlike the thermodynamic microcrystal products incapable of lasing due to intermolecular charge-transfer-mediated excimer formation, the kinetic dye microcrystals have large intermolecular distances and weak intermolecular interactions, supporting highly efficient intramolecular charge-transfer monomer emission and low-threshold lasing. This work demonstrates single-crystal dye lasers, promising to unleash the full potential of laser dyes in solid-state lasers.
- Published
- 2022
3. Highly Luminescent Zero-Dimensional Organic Copper Halide with Low-Loss Optical Waveguides and Highly Polarized Emission
- Author
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Linyuan Lian, Tongjin Zhang, Huaiyi Ding, Peng Zhang, Xiuwen Zhang, Yong-Biao Zhao, Jianbo Gao, Daoli Zhang, Yong Sheng Zhao, and Jianbing Zhang
- Subjects
General Chemical Engineering ,Biomedical Engineering ,General Materials Science - Published
- 2022
4. Organic Synthetic Photonic Systems with Reconfigurable Parity–Time Symmetry Breaking for Tunable Single‐Mode Microlasers
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Chunhuan Zhang, Fang‐Jie Shu, Chang‐Ling Zou, Haiyun Dong, Jiannian Yao, and Yong Sheng Zhao
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Mechanics of Materials ,Mechanical Engineering ,General Materials Science - Published
- 2023
5. Screen-Overprinted Perovskite RGB Microdisk Arrays Based on Wet-Solute-Chemical Dynamics for Full-Color Laser Displays
- Author
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Jie Liang, Kang Wang, Yuxiang Du, Chunhuan Zhang, Yongli Yan, and Yong Sheng Zhao
- Subjects
General Materials Science - Abstract
Owing to outstanding optoelectronic properties, halide perovskites are great candidates for novel laser display applications. However, the realization of their practical flat-panel display applications is challenging because of the incapacity to controllably assemble different halide perovskite microlaser arrays onto an identical substrate as pixelated full-color panels due to intrinsic fragile crystal lattices. Here, perovskite red-green-blue (RGB) microdisk arrays are reported, acting as flat-panels for full-color laser displays. A universal screen-overprinting technology is developed to integrate full-color perovskite microdisk arrays on a prepatterned template, which is on the basis of wet-solute-chemical dynamics involving a combination of surface tailoring and solvent selection. Via such an overprinting method, perovskite RGB microlaser matrices with precise localizations and well-defined dimensions were fabricated on an identical substrate, and each set of RGB microlaser served as a pixel for full-color display panels. On this basis, static and dynamic laser displays have been demonstrated with as-prepared full-color panels. These results will provide novel design concepts and device structures for future full-color laser display applications.
- Published
- 2021
6. Framework-Shrinkage-Induced Wavelength-Switchable Lasing from a Single Hydrogen-Bonded Organic Framework Microcrystal
- Author
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Yuanchao Lv, Zhile Xiong, Yunbin Li, Delin Li, Jiashuai Liang, Yisi Yang, Fahui Xiang, Shengchang Xiang, Yong Sheng Zhao, and Zhangjing Zhang
- Subjects
General Materials Science ,Physical and Theoretical Chemistry - Abstract
Porous organic materials (POMs) have shown great potential for fabricating tunable miniaturized lasers. However, most pure-POM micro/nanolasers are achieved via coordination interactions, during which strong charge exchanges inevitably destroy the intrinsic gain property and even lead to optical quenching, hindering their practical applications. Herein, we reported on an approach to realize hydrogen-bonded organic framework (HOF)-based
- Published
- 2021
7. Magnetic-Field-Driven Reconfigurable Microsphere Arrays for Laser Display Pixels
- Author
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Baipeng Yin, Hao Jia, Hong Wang, Rui Chen, Lixin Xu, Yong Sheng Zhao, Chuang Zhang, and Jiannian Yao
- Subjects
General Engineering ,General Physics and Astronomy ,General Materials Science - Abstract
Reconfigurable microlaser arrays are essential to the construction of display panels where the individual pixel should be highly tunable in resonance mode, optical polarization, and lasing wavelength upon external control signals. Here we demonstrate a facile yet reliable approach to fabrication of organic microlaser pixels, in which the assembly of microsphere arrays on each pixel is controlled according to the near-field magnetostatic confinement. The geometrical configuration of diamagnetic microspheres could be readily modulated with the near-field potential traps by using the external field to alternate the saturation magnetization of the underneath micromagnet. The motion of microspheres can be modulated among several states upon applied field, and the reconfigurable microsphere array is thus achieved with high spatial precision and rapid temporal response. Moreover, both isolated and coupled spheres serve as low-threshold microlasers with tunable optical resonance modes, whereas the switching between the vertical and horizontal alignments of coupled spheres manipulates the polarization of lasing outputs. By repeating the magnetostatic confinement on the same substrate, the full-color laser display pixels with magnetically tunable color expression capability are successfully achieved.
- Published
- 2022
8. Full-color flexible laser displays based on random laser arrays
- Author
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Chunhuan Zhang, Fa Feng Xu, Ji Tang, Yue Hou, Yong Sheng Zhao, Zhonghao Zhou, and Yuqing Fan
- Subjects
Materials science ,Fabrication ,Random laser ,Pixel ,business.industry ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Physics::Optics ,Wearable computer ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,0104 chemical sciences ,law.invention ,law ,Flexible display ,Optoelectronics ,General Materials Science ,0210 nano-technology ,business ,Lasing threshold ,Wearable technology - Abstract
Flexible laser display is a critical component for an information output port in next-generation wearable devices. So far, the lack of appropriate display panels capable of providing sustained operation under rigorous mechanical conditions impedes the development of flexible laser displays with high reliability. Owing to the multiple scattering feedback mechanism, random lasers render high mechanical flexibility to withstand deformation, thus making them promising candidates for flexible display planes. However, the inability to obtain pixelated random laser arrays with highly ordered emissive geometries hinders the application of flexible laser displays in the wearable device. Here, for the first time, we demonstrate a mass fabrication strategy of full-color random laser arrays for flexible display panels. The feedback closed loops can be easily fulfilled in the pixels by multiple scatterings to generate durative random lasing. Due to the sustained operation of random laser, the display performance was well-maintained under mechanical deformations, and as a result, a flexible laser display panel was achieved. Our finding will provide a guidance for the development of flexible laser displays and laser illumination devices.
- Published
- 2021
9. Smart Protein-Based Biolasers: An Alternative Way to Protein Conformation Detection
- Author
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Chunhuan Zhang, Fengqin Hu, Yuqing Fan, Yong Sheng Zhao, Zhen Liu, and Yue Zhang
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Materials science ,Protein Conformation ,Lasers ,fungi ,Fibroin ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Microspheres ,Structural transformation ,0104 chemical sciences ,Microsphere ,Highly sensitive ,Protein structure ,General Materials Science ,Fibroins ,0210 nano-technology ,Lasing threshold ,Microscale chemistry ,Alternative strategy - Abstract
Detecting conformational changes in protein is imperative due to its major role in neurodegenerative disorders. Here, we propose an alternative strategy for monitoring the structural change of proteins based on biological microlasers. Smart responsive protein-based microscale biolasers were constructed by incorporating organic gain medium into the microspheres of silk fibroin via emulsion-solvent evaporation. The lasing characteristic of the biolasers exhibited a sensitive response to the structural transformation of the silk fibroin. With narrowed linewidth, the as-prepared biolasers as sensing signals enable highly sensitive protein conformation detection. These results offer an effective approach to monitoring the protein conformational changes and provide valuable guidance for a better understanding of the relationship between bio-microstructures and their photonic properties.
- Published
- 2021
10. 3D-Printed Möbius Microring Lasers: Topology Engineering in Photonic Microstructures
- Author
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Xianqing Lin, Wu Zhou, Yingying Liu, Fang‐Jie Shu, Chang‐Ling Zou, Chunhua Dong, Cong Wei, Haiyun Dong, Chuang Zhang, Jiannian Yao, and Yong Sheng Zhao
- Subjects
Biomaterials ,General Materials Science ,General Chemistry ,Biotechnology - Abstract
Manipulating photons in artificially structured materials is highly desired in modern photonic technology. Nontrivial topological structures are rapidly emerging as a state-of-art platform for achieving unprecedented fascinating phenomena of photon manipulation. However, the current studies mainly focus on planar structures, and the fabrication of photonic microstructures with specific topological geometric features still remains a great challenge. Extending the topological photonics to 3D microarchitectures is expected to enrich the photon manipulation capabilities and further advance the topological photonic devices. Here, a femtosecond laser direct writing technique is employed to fabricate 3D topological Möbius microring resonators from dye-doped polymer. The high-quality-factor Möbius microring resonator supports a unique spin-orbit coupled lasing at very low threshold. Due to the spin-orbit coupling induced geometric/Berry phase, the Möbius microrings, in striking contrast with ordinary microrings, output laser signals with all polarization states. The manipulation of miniaturized coherent light sources in the fabricated Möbius microrings represents a significant step forward toward 3D topological photonics that offers a novel design philosophy for functional photonic and optoelectronic devices.
- Published
- 2022
11. Pure Metal–Organic Framework Microlasers with Controlled Cavity Shapes
- Author
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Yisi Yang, Yong Sheng Zhao, Yuanchao Lv, Zizhu Yao, Yunbin Li, Haiyun Dong, Cong Wei, Ang Ren, Zhangjing Zhang, Zhile Xiong, and Shengchang Xiang
- Subjects
Fabrication ,Nanostructure ,Chemical substance ,Materials science ,Mechanical Engineering ,Nanophotonics ,Bioengineering ,Nanotechnology ,02 engineering and technology ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Laser ,law.invention ,Crystal ,law ,General Materials Science ,Metal-organic framework ,0210 nano-technology ,Science, technology and society - Abstract
Metal-organic frameworks (MOFs) are an emerging kind of laser material, yet they remain a challenge in the controlled fabrication of crystal nanostructures with desired morphology for tuning their optical microcavities. Herein, the shape-engineering of pure MOF microlasers was demonstrated based on the coordination-mode-tailored method. The one-dimensional (1D) microwires and 2D microplates were selectively fabricated through changing the HCl concentration to tailor the coordination modes. Both the single-crystalline microwires and microplates with strong optical confinement functioned as low-threshold MOF microlasers. Moreover, distinct lasing behaviors of 1D and 2D MOF microcrystals confirm a typical shape-dependent microcavity effect: 1D microwires serve as Fabry-Pérot (FP) resonators, and 2D microplates lead to the whispering-gallery-mode (WGM) microcavities. These results provide a special pathway for the exploitation of MOF-based micro/nanolasers with on-demand functions.
- Published
- 2020
12. Loss compensation of surface plasmon polaritons in organic/metal nanowire heterostructures toward photonic logic processing
- Author
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Fa Feng Xu, Yongjun Li, Kang Wang, Yuanchao Lv, and Yong Sheng Zhao
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Active laser medium ,Materials science ,business.industry ,Surface plasmon ,Physics::Optics ,Heterojunction ,02 engineering and technology ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Surface plasmon polariton ,0104 chemical sciences ,Condensed Matter::Materials Science ,Optoelectronics ,General Materials Science ,Stimulated emission ,Photonics ,0210 nano-technology ,business ,Ohmic contact ,Plasmon - Abstract
Surface plasmon polaritons (SPPs) are crucial for the development of next generation information and communication technologies. However, the ohmic losses inherent to all plasmonic devices seriously limit their practical application in on-chip photonic communications. Here, loss compensation of SPPs and their application in photonic logic processing was demonstrated in rationally designed organic/silver nanowire heterostructures. The heterostructures were synthesized by inserting silver nanowires (AgNWs) into crystalline organic microwires, which served as a microscale optical gain medium. These heterostructures with large organic/metal interfacial areas ensured the efficient energy transfer from excitons to SPPs. Gain for subwavelength SPPs in the heterostructure was achieved through stimulated emission of strongly confined SPPs. Furthermore, cascade gain was performed to realize basic nanoscale photonic devices, such as Boolean logic units. The results would pave an alternative avenue to incorporating SPP-enhanced devices into hybrid photonic circuitry.
- Published
- 2019
13. Differential Polymer Chain Scission Enables Free-Standing Microcavity Laser Arrays
- Author
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Haiyun Dong, Chunhuan Zhang, Wu Zhou, Jiannian Yao, and Yong Sheng Zhao
- Subjects
Mechanics of Materials ,Mechanical Engineering ,General Materials Science - Abstract
Control over material architectures is essential to the performance of photonic devices and systems. Optical isolation of the photonic materials from substrates can significantly enhance their performance but suffers from complicated fabrication processes and limited applications. Here a differential polymer chain scission strategy is proposed to fabricate free-standing photonic structures based on one-step electron-beam direct writing on polymer bilayers (EOB). The polymer molecular mass-dependent sensitivity to electron beam enables differential patterning of the two layers of polymers, leading to the direct formation of suspended optical microcavities. The EOB technique features high materials compatibility and design flexibility for the optical microcavities, which significantly expands the application scope of the suspended optical microcavities. As well as providing a versatile strategy for building high-performance photonic materials, the results provide a promising platform for innovative applications of optical microstructures.
- Published
- 2021
14. Chiral Hybrid Perovskite Single‐Crystal Nanowire Arrays for High‐Performance Circularly Polarized Light Detection
- Author
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Fengqin Hu, Chunhuan Zhang, Zhonghao Zhou, Xiaolong Liu, Yong Sheng Zhao, Ang Ren, Yuqing Fan, Zhen Liu, Chan Qiao, and Yuwei Guan
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Materials science ,nanowire arrays ,General Chemical Engineering ,perovskite photodetectors ,Science ,Nanowire ,General Physics and Astronomy ,Medicine (miscellaneous) ,Photodetector ,Biochemistry, Genetics and Molecular Biology (miscellaneous) ,Responsivity ,General Materials Science ,Research Articles ,Circular polarization ,Photocurrent ,business.industry ,chiral hybrid perovskites ,General Engineering ,Photoelectric effect ,Polarization (waves) ,perovskite nanowires ,Optoelectronics ,business ,circularly polarized light detection ,Single crystal ,Research Article - Abstract
Circularly polarized light (CPL) detection has emerged as a key technology for various optoelectronics. Chiral hybrid perovskites (CHPs) that combine CPL‐sensitive absorption induced by chiral organic ligands and superior photoelectric properties of perovskites are promising candidates for direct CPL detection. To date, most of the CHP detectors are made up of polycrystalline thin‐film, which results in a rather limited discrimination of CPL due to the existence of redundant impurities and intrinsic defect states originating from rapid crystallization process. Here, it is developed a direct CPL detector with high photocurrent and polarization selectivity based on low‐defect CHP single‐crystal nanowire arrays. Large‐scale CHP nanowires are obtained through a micropillar template‐assisted capillary‐bridge rise approach. Thanks to the high crystallinity and ordered crystallographic alignment of these arrays, a CPL photodetector with high light on/off ratio of 1.8 × 104, excellent responsivity of 1.4 A W−1, and an outstanding anisotropy factor of 0.24 for photocurrent has been achieved. These results would provide useful enlightenment for direct CPL detection in high‐performance chiral optoelectronics., An efficient circularly polarized light (CPL) detector is demonstrated with large‐scale chiral hybrid perovskite (CHP) nanowire arrays. Based on the high photocurrent and polarization selectivity of CHP single‐crystals, high‐performance CPL detectors with high light on/off ratio and excellent polarization distinguishability through arranging such single‐crystalline CHP nanowires into low‐defect arrays are achieved.
- Published
- 2021
15. Exciton-Polaritons and Their Bose-Einstein Condensates in Organic Semiconductor Microcavities
- Author
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Zhengjun Jiang, Ang Ren, Yongli Yan, Jiannian Yao, and Yong Sheng Zhao
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Mechanics of Materials ,Mechanical Engineering ,General Materials Science - Abstract
Exciton-polaritons are half-light, half-matter bosonic quasiparticles formed by strong exciton-photon coupling in semiconductor microcavities. These hybrid particles possess the strong nonlinear interactions of excitons and keep most of the characteristics of the underlying photons. As bosons, above a threshold density they can undergo Bose-Einstein condensation to a polariton condensate phase and exhibit a rich variety of exotic macroscopic quantum phenomena in solids. Recently, organic semiconductors have been considered as a promising material platform for these studies due to their room-temperature stability, good processability, and abundant photophysics and photochemistry. Herein, recent advances of exciton-polaritons and their Bose-Einstein condensates in organic semiconductor microcavities are summarized. First, the basic physics is introduced, and then their emerging applications are highlighted. The remaining questions are also discussed and a personal viewpoint about the potential directions for future research is given.
- Published
- 2021
16. Geometry-Programmable Perovskite Microlaser Patterns for Two-Dimensional Optical Encryption
- Author
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Zhenhua Gao, Kang Wang, Yongli Yan, Jiannian Yao, Chuang Zhang, Yong Sheng Zhao, Rui Chen, and Jie Liang
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Fabrication ,Cryptographic primitive ,business.industry ,Computer science ,Mechanical Engineering ,Physics::Optics ,Bioengineering ,Cryptography ,General Chemistry ,Condensed Matter Physics ,Laser ,Encryption ,law.invention ,law ,Optoelectronics ,General Materials Science ,business ,Lithography ,Lasing threshold ,Perovskite (structure) - Abstract
Lasing signals with easily distinguishable readout and cavity-geometry-dependent output are emerging as novel cryptographic primitives for two-dimensional (2D) optical encryption, while their practical application is restricted by the challenge of integrating different lasing elements onto an identical 2D pattern. Herein, a lithographic template-confined crystallization approach was proposed to prepare large-scale perovskite microstructures with any desired geometries and locations, which enabled them to serve as 2D lasing patterns for reliable encryption and authentication. These prepatterned perovskite microstructures realized whispering-gallery-mode lasing and also demonstrated outstanding reproducibility of lasing actions. Benefiting from the feature of their cavity-geometry-dependent lasing thresholds, we achieved controllable laser output from different shaped elements, which was further utilized for the proof-of-concept demonstration of a cryptographic implementation. The remarkable lasing performance and feasible preparation of 2D microlaser patterns with customized geometries and locations provide us deep insights into the concepts and fabrication technologies for 2D optical encryption.
- Published
- 2021
17. 3D Laser Displays Based on Circularly Polarized Lasing from Cholesteric Liquid Crystal Arrays
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Fa Feng Xu, Xiuqin Zhan, Jiannian Yao, Yong Sheng Zhao, Zhonghao Zhou, and Yongli Yan
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Materials science ,business.industry ,Cholesteric liquid crystal ,Mechanical Engineering ,Stereo display ,Laser ,law.invention ,Gamut ,Mechanics of Materials ,law ,Optoelectronics ,RGB color model ,General Materials Science ,Contrast ratio ,business ,Lasing threshold ,Circular polarization - Abstract
3D laser displays play an important role in next-generation display technologies owing to the ultimate visual experience they provide. Circularly polarized (CP) laser emissions, featuring optical rotatory power and invariability under rotations, are attractive for 3D displays due to potential in enhancing contrast ratio and comfortability. However, the lack of pixelated self-emissive CP microlaser arrays as display panels hinders the implementation of 3D laser displays. Here, full-color 3D laser displays are demonstrated based on CP lasing with inkjet-printed cholesteric liquid crystal (CLC) arrays as display panels. Individual CP lasers are realized by embedding fluorescent dyes into CLCs with their left-/right-handed helical superstructures serving as distributed feedback microcavities, bringing in ultrahigh circular polarization degree values (gem = 1.6). These CP microlaser pixels exhibit excellent far-field color-rendering features and a relatively large color gamut for high-fidelity displays. With these printed CLC red-green-blue (RGB) microlaser arrays serving as display panels, proof-of-concept full-color 3D laser displays are demonstrated via delivering images with orthogonal CP laser emissions into one's left and right eyes. These results provide valuable enlightenment for the development of 3D laser displays.
- Published
- 2021
18. Randomly Induced Phase Transformation in Silk Protein-Based Microlaser Arrays for Anticounterfeiting
- Author
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Wu Zhou, Chunhuan Zhang, Yue Hou, Yuqing Fan, Zhonghao Zhou, Zhenhua Gao, Jiannian Yao, and Yong Sheng Zhao
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Authentication ,Materials science ,business.industry ,Mechanical Engineering ,Lasers ,Phase (waves) ,Biocompatible Materials ,Cryptographic protocol ,Laser ,Microarray Analysis ,Signal ,law.invention ,Mechanics of Materials ,law ,Code (cryptography) ,Optoelectronics ,Printing ,General Materials Science ,business ,Coloring Agents ,Fibroins ,Lasing threshold ,Randomness - Abstract
Anticounterfeiting labels based on physical unclonable functions (PUFs) exhibit high security with unreplicable code outputs, making them an ideal platform to realize unbreakable anticounterfeiting. Although various schemes are proposed for PUF labels, the utilization of natural randomness suffers from unpredictable signal extraction sites, which poses a challenge to efficient and convenient authentication for practical anticounterfeiting applications. Here, a covert optical PUF-based cryptographic protocol from silk protein-based microlaser (SML) arrays that possess hidden randomness of lasers for unclonable lasing signals as well as a defined location for efficient identification is proposed. The initial SMLs are patterned by casting laser dye-doped regenerated silk fibroin solution, resulting in a uniform microlaser array with regulated positions. With the SML array as substrate, random methanol microdroplets are stochastically sprayed on the SML array, which eventually induces uneven lasing signal changes of the patterned microlasers. The treated SML array possesses the deterministic readout sites of laser signals and unrepeatable signal distribution characteristics, which can guarantee efficient authentication and high security when serving as an anticounterfeiting label.
- Published
- 2021
19. Single‐Crystalline Perovskite p–n Junction Nanowire Arrays for Ultrasensitive Photodetection
- Author
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Yuwei Guan, Chunhuan Zhang, Zhen Liu, Yiman Zhao, Ang Ren, Jie Liang, Fengqin Hu, and Yong Sheng Zhao
- Subjects
Mechanics of Materials ,Mechanical Engineering ,General Materials Science - Abstract
Highly sensitive photodetectors play significant roles in modern optoelectronic integrated circuits. Constructing p-n junctions has been proven to be a particularly powerful approach to realizing sensitive photodetection due to their efficient carrier separation. Recently, p-n-junction photodetectors based on organic-inorganic hybrid perovskites, which combine favorable optoelectronic performance with facile processability, hold great potential in practical applications. So far, these devices have generally been made of polycrystalline films, which exhibit poor carrier-transport efficiency, impeding the further improvement of their photoresponsivities. Here, a type of ultrasensitive photodetector based on single-crystalline perovskite p-n-junction nanowire arrays is demonstrated. The single-crystalline perovskite p-n-junction nanowire arrays not only possess high crystallinity that enables efficient carrier transport but also form a built-in electric field facilitating effective carrier separation. As a result, the devices show excellent photosensitivity over a wide spectral range from 405 to 635 nm with an outstanding responsivity of 2.65 × 10
- Published
- 2022
20. Hydrogen-Bonded Organic Framework Microlasers with Conformation-Induced Color-Tunable Output
- Author
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Yong Sheng Zhao, Delin Li, Yinan Yao, Zhile Xiong, Yuanchao Lv, Shengchang Xiang, Kaicong Cai, Ang Ren, and Zhangjing Zhang
- Subjects
Dye laser ,Fabrication ,Materials science ,Hydrogen ,business.industry ,Nanophotonics ,chemistry.chemical_element ,Characterisation of pore space in soil ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,0104 chemical sciences ,law.invention ,chemistry ,law ,Optoelectronics ,General Materials Science ,Self-assembly ,0210 nano-technology ,business ,Lasing threshold - Abstract
Porous organic frameworks have emerged as the promising platforms to construct tunable microlasers. Most of these microlasers are achieved from metal-organic frameworks via meticulously accommodating the laser dyes with the sacrifice of the pore space, yet they often suffer from the obstacles of either relatively limited gain concentration or sophisticated fabrication techniques. Herein, we reported on the first hydrogen-bonded organic framework (HOF) microlasers with color-tunable performance based on conformation-dependent stimulated emissions. Two types of HOF microcrystals with the same gain lumnogen as the building block were synthesized via a temperature-controlled self-assembly method. The distinct frameworks offer different conformations of the gain building block, which lead to great impacts on their conjugation degrees and excited-state processes, resulting in remarkably distinct emission colors (blue and green). Accordingly, blue/green-color lasing actions were achieved in these two types of HOFs based on well-faceted assembled wire-like cavities. These results offer a deep insight on the exploitation of HOF-based miniaturized lasers with desired nanophotonics performances.
- Published
- 2021
21. Near-Infrared Microlasers from Self-Assembled Spiropyrane-Based Microsphercial Caps
- Author
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Yue Hou, Manman Chu, Lina Tan, Bing Fang, Yan Shi, Meizhen Yin, Yong Sheng Zhao, and Pengyu Li
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Indoles ,Materials science ,Lasers ,Near-infrared spectroscopy ,Nanotechnology ,02 engineering and technology ,Nitro Compounds ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Biomedical tissue ,01 natural sciences ,Microspheres ,0104 chemical sciences ,Self assembled ,Benzopyrans ,General Materials Science ,0210 nano-technology - Abstract
Near-infrared (NIR) microlasers play a significant role in telecommunication and biomedical tissue imaging. However, it remains a big challenge to realize NIR microlasers because of the difficulty in preparing highly efficient NIR luminescent materials and perfect optical resonators. Here, we propose a molecular design strategy to creatively realize the first spiropyrane (SP)-based NIR microlasers with low threshold from self-assembled microsphercial caps. The tetraphenylethylene (TPE) moiety with a highly twisted conformation provides a large free volume to facilitate the photoisomerization process of SP and enhance NIR emission of merocyanine in the solid state. Moreover, self-assembled TPE-SP microsphercial caps simultaneously serve as gain media and resonant microcavities, providing optical gain and feedback for NIR laser oscillations with a low threshold (3.68 μJ/cm
- Published
- 2019
22. Epitaxial growth of dual-color-emitting organic heterostructuresviabinary solvent synergism driven sequential crystallization
- Author
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Jianmin Gu, Chuang Zhang, Yong Sheng Zhao, Jinling Zhong, Man Feng, Guang Cong Zhang, Ziming Zhang, Bin Wen, and Baipeng Yin
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Anthracene ,Materials science ,Nucleation ,Heterojunction ,02 engineering and technology ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Epitaxy ,01 natural sciences ,0104 chemical sciences ,law.invention ,Solvent ,Condensed Matter::Materials Science ,chemistry.chemical_compound ,chemistry ,Chemical physics ,law ,Molecule ,General Materials Science ,Solubility ,Crystallization ,0210 nano-technology - Abstract
The controlled construction of organic heterostructured architectures derived from molecules with similar nucleation thresholds and concentrations has been rare and remains a great challenge. Herein, we report a sequential epitaxial growth to synthesize dual-color-emitting organic heterostructures with 9,10-bis(phenylethynyl)anthracene (BPEA) microwire trunks and tris-(8-hydroxyquinoline)aluminium (Alq3) microstructure branches by an anti-solvent induced sequential crystallization strategy. During the epitaxial growth process, the hydrogen-bonding interactions of the anti-solvent and solvent cause a large change in the solubility and crystallization rate of BPEA and Alq3 molecules in the mixed system, which facilitates sequential crystallization of organic molecule pairs with similar nucleation thresholds and concentrations into desired heterostructures by manipulating the synergism of anti-solvents and solvents. The Förster resonant energy transfer process in heterostructures could be modulated by varying the structure of heterostructures, such as the shape, amount and angles of the branches. The present synthesis strategy provides a unique insight into the detailed formation mechanism of complex organic heterostructures, further guiding the construction of more functional heterostructure materials.
- Published
- 2019
23. Tailoring the Energy Levels and Cavity Structures toward Organic Cocrystal Microlasers
- Author
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Wei Zhang, Yongli Yan, Manman Chu, Zhonghao Zhou, Bing Qiu, Yong Sheng Zhao, Xinzheng Yang, Jiannian Yao, and Yongjun Li
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Materials science ,Intermolecular force ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Laser ,Population inversion ,01 natural sciences ,Cocrystal ,0104 chemical sciences ,law.invention ,Chemical physics ,law ,General Materials Science ,Stimulated emission ,Energy structure ,0210 nano-technology ,Lasing threshold ,Energy (signal processing) - Abstract
Organic cocrystals with unique energy-level structures are potentially a new class of materials for the development of versatile solid-state lasers. However, till now, the stimulated emission in cocrystal materials remains a big challenge possibly because of the nonradiative charge-transfer (CT) transitions. Here, for the first time, we report organic cocrystal microlasers constructed by simultaneously tailoring the energy levels and cavity structures based on the intermolecular halogen-bonding interactions. The intermolecular interactions triggered different self-assembly processes, resulting in distinct types of high-quality resonant microcavities. More importantly, the halogen-bonding interactions alleviated intermolecular CT and thus brought about a favorable four-level energy structure for the population inversion and tunable lasing in the cocrystals.
- Published
- 2018
24. Superkinetic Growth of Oval Organic Semiconductor Microcrystals for Chaotic Lasing
- Author
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Haiyun Dong, Chunhuan Zhang, Fang-Jie Shu, Jiannian Yao, Yongli Yan, Chang-Ling Zou, and Yong Sheng Zhao
- Subjects
Mesoscopic physics ,Materials science ,business.industry ,Mechanical Engineering ,Physics::Optics ,Crystal growth ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Photonic metamaterial ,Nonlinear Sciences::Chaotic Dynamics ,Organic semiconductor ,Semiconductor ,Mechanics of Materials ,Optoelectronics ,General Materials Science ,Photonics ,0210 nano-technology ,Anisotropy ,business ,Lasing threshold - Abstract
Synthesis of novel mesoscopic semiconductor architectures continually generates new photonic knowledge and applications. However, it remains a great challenge to synthesize semiconductor microcrystals with smoothly curved surfaces owing to the crystal growth anisotropy. Here, a superkinetic crystal growth method is developed to synthesize 2D oval organic semiconductor microcrystals. The solid source dispersion induces an exceptionally large molecular supersaturation for vapor deposition, which breaks the crystal growth anisotropy. The synthesized stadium-shaped organic semiconductor microcrystals naturally constitute fully chaotic optical microresonators. They support low-threshold lasing on high-quality-factor scar modes localized near the stadium boundary and directional laser emission assisted by the chaotic modes. These results will reshape the understanding of the crystal growth theory and provide valuable guidance for crystalline photonic materials design.
- Published
- 2021
25. Optically Pumped Lasing in Microscale Light-Emitting Electrochemical Cell Arrays for Multicolor Displays
- Author
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Yongli Yan, Manman Chu, Yong Sheng Zhao, Zhonghao Zhou, and Jie Liang
- Subjects
Blue laser ,Materials science ,business.industry ,Mechanical Engineering ,Bioengineering ,02 engineering and technology ,General Chemistry ,Electroluminescence ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Laser ,law.invention ,Color rendering index ,Resonator ,law ,Optoelectronics ,General Materials Science ,Light-emitting electrochemical cell ,0210 nano-technology ,business ,Lasing threshold ,Microscale chemistry - Abstract
Laser displays, which offer wide achievable color gamut and excellent color rendering, have emerged as a promising next-generation display technology. Constructing display panels composed of pixelated microlaser arrays is of great significance for the actualization of laser displays in the flat-panel sector. Here, we report microscale light-emitting electrochemical cell (LEC) arrays that operate as both optically pumped lasers and electroluminescence devices, which can be applied as self-emissive panels for high quality displays. Optically pumped red, green, and blue laser emissions were achieved in individual circular microcells consisting of corresponding conjugated polymers and electrolytes, suggesting that the microstructures can act as resonators for coherent outputs. As-prepared microstructures possess a narrowed recombination region, which dramatically increases the current density by 3 orders of magnitude under pulsed operation, compared with the corresponding thin-film devices, representing a promising solution-processed device platform for electrical pumping. Under programmable electrical excitation, both static and dynamic displays were demonstrated with such microscale LEC arrays as display panels. The prominent performance of the demonstrated structures (microlaser arrays embedded in LEC devices) provide us deep insight into the concepts and device constructions of electrically driven laser displays.
- Published
- 2020
26. Supercrystallographic Reconstruction of 3D Nanorod Assembly with Collectively Anisotropic Upconversion Fluorescence
- Author
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Yong Sheng Zhao, Zhongwu Wang, Hongwu Xu, Ruipeng Li, Chunxia Li, Yulian Liu, Ran Ni, Zewei Quan, Kerong Deng, Lili Xu, Xin Huang, Ji Tang, and Qun-li Lei
- Subjects
Materials science ,Nanotubes ,Scattering ,Mechanical Engineering ,Superlattice ,Nanoparticle ,Metamaterial ,Bioengineering ,02 engineering and technology ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Photon upconversion ,Fluorescence ,Reciprocal lattice ,Crystallography ,Anisotropy ,Nanoparticles ,General Materials Science ,Nanorod ,Self-assembly ,0210 nano-technology - Abstract
Constructing three-dimensional (3D) metamaterials from functional nanoparticles endows them with emerging collective properties tailored by the packing geometries. Herein, we report 3D supercrystals self-assembled from upconversion nanorods (NaYF4:Yb,Er NRs), which exhibit both translational ordering of NRs and orientational ordering between constituent NRs in the superlattice (SL). The construction of 3D reciprocal space mappings (RSMs) based on synchrotron-based X-ray scattering measurements was developed to uncover the complex structure of such an assembly. That is, the two main orthogonal sets of hexagonal close-packing (hcp)-like SLs share the [110]SL axis, and NRs within the SL possess orientational relationships of [120]NR//[100]SL, [210]NR//[010]SL, and [001]NR//[001]SL. Notably, these supercrystals containing well-aligned NRs exhibit collectively anisotropic upconversion fluorescence in two perpendicular directions. This study not only demonstrates novel crystalline superstructures and functionality of NR-based 3D assemblies but also offers a unique tool for deciphering a wide range of complex nanoparticle supercrystals.
- Published
- 2020
27. Wettability-Guided Screen Printing of Perovskite Microlaser Arrays for Current-Driven Displays
- Author
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Fa Feng Xu, Yong Sheng Zhao, Jie Liang, Yongli Yan, Kang Wang, Yuxiang Du, Zhao Jinyang, Chuang Zhang, and Xiaolong Liu
- Subjects
Fabrication ,Materials science ,Pixel ,business.industry ,Mechanical Engineering ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,0104 chemical sciences ,law.invention ,Mechanics of Materials ,law ,Screen printing ,Optoelectronics ,General Materials Science ,Wetting ,0210 nano-technology ,business ,Diode ,Perovskite (structure) ,Light-emitting diode - Abstract
Halide perovskites have shown tremendous potential for next-generation flat-panel laser displays due to their remarkable optoelectronic properties and outstanding material processability; however, the lack of a general approach for the fast growth of perovskite laser arrays capable of electrical operations impedes actualization of their display applications. Herein, a universal and robust wettability-guided screen-printing technique is reported for the rapid growth of large-scale multicolor perovskite microdisk laser arrays, which can serve as laser display panels and further be used to realize current-driven displays. The perovskite microlasers are precisely defined with controlled physical dimensions and spatial locations by such a printing strategy, and each perovskite microlaser serves as a pixel of a display panel. Moreover, the screen-printing procedure is highly compatible with light-emitting diode (LED) device architectures, which is favorable for the mass production of micro-LED arrays. On this basis, a prototype of a current-driven display is demonstrated with desired functionalities. The outstanding performance and feasible fabrication of screen-printed perovskite microlaser arrays embedded in LEDs provide deep insights into the concepts and device architectures of electrically driven laser display technology.
- Published
- 2020
28. Suppressing Nonradiative Processes of Organic Dye with Metal–Organic Framework Encapsulation toward Near-Infrared Solid-State Microlasers
- Author
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Haiyun Dong, Chunhuan Zhang, Yuan Liu, Zhenhua Gao, Kang Wang, Xiaolong Liu, Fengqin Hu, and Yong Sheng Zhao
- Subjects
Materials science ,Chemical substance ,Fabrication ,business.industry ,Physics::Optics ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Laser ,Population inversion ,01 natural sciences ,0104 chemical sciences ,law.invention ,law ,Optoelectronics ,General Materials Science ,Metal-organic framework ,0210 nano-technology ,Science, technology and society ,business ,Lasing threshold ,Microscale chemistry - Abstract
Organic materials are an important class of gain media for fabricating miniaturized lasers because they combine fabrication simplicity with wide spectral coverage and tunability. However, progress toward near-infrared (NIR) organic solid-state lasers has been limited because of serious nonradiative processes originating from the severe intermolecular interaction in the condensed state. Here, we develop a strategy to realize room-temperature NIR microscale lasers through encapsulating organic dyes into the cavities of metal-organic frameworks (MOFs). The spatial confinement of the dye molecules within the MOF pores contributes to suppressing the multiple nonradiative processes (i.e., aggregation-caused quenching and exciton-exciton annihilation). This results in a much higher radiative efficiency and thus much easier population inversion and low-threshold NIR lasing. Furthermore, the lasing wavelength can be further expanded based on the tailorable energy levels of the dye molecules. The results will provide useful enlightenment for the development of miniaturized NIR laser sources for new photonic applications.
- Published
- 2018
29. Proton-Controlled Organic Microlaser Switch
- Author
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Haiyun Dong, Kang Wang, Yong Sheng Zhao, Yongli Yan, Jiannian Yao, Zhenhua Gao, Jun Yi, and Wei Zhang
- Subjects
Range (particle radiation) ,Materials science ,business.industry ,General Engineering ,Rational design ,General Physics and Astronomy ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,0104 chemical sciences ,law.invention ,Wavelength ,Semiconductor ,law ,Optoelectronics ,General Materials Science ,Photonics ,0210 nano-technology ,business ,Lasing threshold ,Microscale chemistry - Abstract
Microscale laser switches have been playing irreplaceable roles in the development of photonic devices with high integration levels. However, it remains a challenge to switch the lasing wavelengths across a wide range due to relatively fixed energy bands in traditional semiconductors. Here, we report a strategy to switch the lasing wavelengths among multiple states based on a proton-controlled intramolecular charge-transfer (ICT) process in organic dye-doped flexible microsphere resonant cavities. The protonic acids can effectively bind onto the ICT molecules, which thus enhance the ICT strength of the dyes and lead to a red-shifted gain behavior. On this basis, the gain region was effectively modulated by using acids with different proton-donating ability, and as a result, laser switching among multiple wavelengths was achieved. The results will provide guidance for the rational design of miniaturized lasers with performances based on the characteristic of organic optoelectronic materials.
- Published
- 2018
30. Two-Dimensional Pyramid-like WS2 Layered Structures for Highly Efficient Edge Second-Harmonic Generation
- Author
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Jiannian Yao, Yong Sheng Zhao, Yongjun Li, Yingying Liu, Xianqing Lin, Wei Zhang, Kang Wang, Yongli Yan, and Cong Wei
- Subjects
Materials science ,business.industry ,Energy conversion efficiency ,General Engineering ,Nanophotonics ,Physics::Optics ,General Physics and Astronomy ,Second-harmonic generation ,Resonance ,Nonlinear optics ,02 engineering and technology ,Edge (geometry) ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Nonlinear system ,Optoelectronics ,General Materials Science ,0210 nano-technology ,business ,Pyramid (geometry) - Abstract
Two-dimensional (2D) layered materials, with large second-order nonlinear susceptibility, have received much scientific interest due to their potential applications in nonlinear optical devices. However, the atomic thickness of 2D layered materials leads to poor field confinement and weak light–matter interaction at the nanoscale, resulting in low nonlinear conversion efficiency. Here, 2D pyramid-like multilayer (P-multilayer) layered structures are fabricated for efficient edge second-harmonic generation (SHG) based on the enhanced light–matter interaction in whispering-gallery mode (WGM) cavities. The P-multilayer 2D layered materials, where the basal planes shrink gradually from the bottom to the top layers, exhibit efficient edge SH radiation due to the partial destructive interference of nonlinear polarizations between the neighboring atomic layers. Moreover, the well-defined 2D plate-like triangle morphology of P-multilayer WS2 forms a WGM resonance cavity, which results in enhanced light–matter int...
- Published
- 2018
31. Tailoring the structures and photonic properties of low-dimensional organic materials by crystal engineering
- Author
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Jin Wang, Shanlin Qiao, Aibing Chen, Jianmin Gu, Wei Zhang, Yifeng Yu, Bilal Shahid, Manman Chu, Qing Li, and Yong Sheng Zhao
- Subjects
Materials science ,business.industry ,Photonic integrated circuit ,Physics::Optics ,Crystal growth ,Nanotechnology ,02 engineering and technology ,Adhesion ,Weak interaction ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Crystal engineering ,01 natural sciences ,0104 chemical sciences ,symbols.namesake ,symbols ,Molecule ,General Materials Science ,Photonics ,van der Waals force ,0210 nano-technology ,business - Abstract
Low-dimensional organic materials have given rise to tremendous interest in optoelectronic applications, owing to their controllable photonic properties. However, the controlled-synthesis approaches for organic nano-/micro-architectures are very difficult to attain, because the weak interaction (van der Waals force) between the organic molecules cannot dominate the kinetic process of crystal growth. We report a simple method, which involves selective adhesion to the organic crystal plane by hydrogen-bonding interaction for modulating the crystal growth process, which leads either to the self-assembly of one organic molecule into two-dimensional (2D) microsheets with an obvious asymmetric light propagation or one-dimensional (1D) microrods with low propagation loss. The method of tailoring the structures and photonic properties for fabricating different micro-structures would provide enlightenment for the development of tailor-made mini-sized devices for photonic integrated circuits.
- Published
- 2018
32. Surface tension driven aggregation of organic nanowires via lab in a droplet
- Author
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Yong Sheng Zhao, Jianmin Gu, Baipeng Yin, Shaoyan Fu, Ziming Zhang, Faming Gao, Man Feng, and Haiyun Dong
- Subjects
Materials science ,Aggregate (composite) ,Nanostructure ,Nanowire ,Nanophotonics ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Surface tension ,General Materials Science ,0210 nano-technology - Abstract
Directing the architecture of complex organic nanostructures is desirable and still remains a challenge in areas of materials science due to their structure-dependent collective optoelectronic properties. Herein, we demonstrate a simple and versatile solution strategy that allows surface tension to drive low-dimensional nanostructures to aggregate into complex structures via a lab in a droplet technique. By selecting a suitable combination of a solvent and an anti-solvent with controllable surface tension difference, the droplets can be automatically cracked into micro-droplets, which provides an aggregation force directed toward the centre of the droplet to drive the low-dimensional building blocks to form the special aggregations during the self-assembly process. This synthetic strategy has been shown to be universal for organic materials, which is beneficial for further optimizing the optoelectronic properties. These results contribute to gaining an insightful understanding on the detailed growth mechanism of complex organic nanostructures and greatly promoting the development of organic nanophotonics.
- Published
- 2018
33. Loss compensation during subwavelength propagation of enhanced second-harmonic generation signals in a hybrid plasmonic waveguide
- Author
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Jiannian Yao, Wei Zhang, Haiyun Dong, Cong Wei, Jian Ye, Jianmin Gu, Xianqing Lin, Yongli Yan, and Yong Sheng Zhao
- Subjects
Diffraction ,Coupling ,Materials science ,business.industry ,Physics::Optics ,Second-harmonic generation ,02 engineering and technology ,Dielectric ,021001 nanoscience & nanotechnology ,01 natural sciences ,010309 optics ,Wavelength ,0103 physical sciences ,Materials Chemistry ,Optoelectronics ,General Materials Science ,Photonics ,0210 nano-technology ,business ,Ohmic contact ,Plasmon - Abstract
Ultracompact coherent light sources with broadband wavelength tunability and subwavelength optical waveguiding have attracted extensive attention due to their potential applications ranging from multicolor detection to multiband on-chip photonic communication. Metal–dielectric nonlinear structures, which comprise nonlinear dielectric materials and metal films, have been widely used to generate nanoscale broadband tunable coherent light sources through the second-harmonic generation process below the diffraction limit. However, restricted by high ohmic losses at the metal–dielectric surface, subwavelength propagation of SHG signals with low loss remains a big challenge. Here, a novel strategy is utilized to reduce the propagation loss of SHG signals based on the coupling between the waveguide mode and plasmonic mode in a hybrid plasmonic waveguide (HPW). The generated hybrid plasmonic mode in the HPW exhibits strong optical confinement around the nonlinear dielectric and insulating gap, which is beneficial for minimizing the ohmic losses at the metal–dielectric interface and enhancing the light–matter interaction below the diffraction limit. Moreover, under the phase matching condition, the propagation loss of SHG signals is partially compensated for by the frequency conversion of the fundamental wave (FW) through the SHG process. As a result, low propagation loss of enhanced SHG signals at a subwavelength scale is realized in HPWs.
- Published
- 2018
34. Solid-state fluorescent materials based on coumarin derivatives: polymorphism, stimuli-responsive emission, self-assembly and optical waveguides
- Author
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Na Zhao, Nan Li, Rong Rong Cui, Yong Sheng Zhao, and Yuan Lv
- Subjects
Materials science ,Photoluminescence ,02 engineering and technology ,Thermal treatment ,Photoelectric effect ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,Fluorescence ,0104 chemical sciences ,Polymorphism (materials science) ,Materials Chemistry ,Molecule ,General Materials Science ,Self-assembly ,0210 nano-technology ,Single crystal - Abstract
Solid-state fluorescent materials have attracted a surge of interest in recent years due to their wide applications in the fields of photoelectric devices, memory storage and fluorescent probes. Compared to the synthesis of new molecules, exploring new properties in known molecules is a facile approach to obtain functionalized fluorescent materials. In this report, we systematically explored the solid-state photoluminescence properties and applications of 7-(diethylamino)coumarin-3-aldehyde (DCA) and 7-(diethylamino)coumarin-3-carboxylic acid (DCCA). Both fluorophores exhibited a special concentration-dependent emission effect. They displayed polymorphism dependent solid-state emission and single crystal analysis revealed that enhanced overlap between neighbouring molecules resulted in a red-shifted emission. Crystal-to-crystal transformation has also been achieved for both DCA and DCCA by employing an external thermal treatment. In addition, the solid powder of DCA and DCCA displayed fluorescence response to HCl and NH3 gas with high sensitivity. Furthermore, 1D micromaterials were assembled for both fluorophores and DCA exhibited outstanding optical waveguide behavior.
- Published
- 2018
35. Orientation-Dependent Exciton–Plasmon Coupling in Embedded Organic/Metal Nanowire Heterostructures
- Author
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Yongjun Li, Yong Sheng Zhao, Qian Peng, Jiannian Yao, and Yan Hong
- Subjects
Materials science ,business.industry ,Exciton ,Surface plasmon ,General Engineering ,Nanophotonics ,Physics::Optics ,General Physics and Astronomy ,Heterojunction ,02 engineering and technology ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Surface plasmon polariton ,0104 chemical sciences ,Coupling (electronics) ,Condensed Matter::Materials Science ,Dipole ,Physics::Atomic and Molecular Clusters ,Optoelectronics ,General Materials Science ,0210 nano-technology ,business ,Plasmon - Abstract
The excitation of surface plasmons by optical emitters based on exciton-plasmon coupling is important for plasmonic devices with active optical properties. It has been theoretically demonstrated that the orientation of exciton dipole can significantly influence the coupling strength, yet systematic study of the coupling process in nanostructures is still hindered by the lack of proper material systems. In this work, we have experimentally investigated the orientation-dependent exciton-plasmon coupling in a rationally designed organic/metal nanowire heterostructure system. The heterostructures were prepared by inserting silver nanowires into crystalline organic waveguides during the self-assembly of dye molecules. Structures with different exciton orientations exhibited varying coupling efficiencies. The near-field exciton-plasmon coupling facilitates the design of nanophotonic devices based on the directional surface plasmon polariton propagations.
- Published
- 2017
36. Dual-Wavelength Switchable Vibronic Lasing in Single-Crystal Organic Microdisks
- Author
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Xianqing Lin, Jiannian Yao, Haiyun Dong, Yong Sheng Zhao, Zhonghao Zhou, and Chunhuan Zhang
- Subjects
Materials science ,Population ,Physics::Optics ,Bioengineering ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,law.invention ,law ,General Materials Science ,education ,Electronic band structure ,education.field_of_study ,business.industry ,Mechanical Engineering ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Laser ,0104 chemical sciences ,Wavelength ,Semiconductor ,Optoelectronics ,Photonics ,0210 nano-technology ,business ,Ground state ,Lasing threshold - Abstract
Wavelength switchable micro/nanoscale laser is essential to construct various ultracompact photonic devices. However, traditional semiconductors as the gain media generally provide only monochromatic laser output due to their continuous energy band structures. For luminescent conjugated molecules, the broad emission band usually contains a series of vibronic peaks, which is very helpful for extending the lasing spectrum to several different wavelengths. Here we propose a novel strategy to realize wavelength switchable lasers based on the controlled competition of dual-wavelength vibronic lasing in single-component organic microcrystals. The vibrationally structured fluorescence property of the single-crystal organic microdisks brings dual-wavelength lasing at different vibronic bands. Their relative optical gain intensity was modulated by controlling the population on the certain vibronic level of the ground state with varied temperature, which consequently enabled the reversible switching of the dual-wav...
- Published
- 2016
37. Controlled Outcoupling of Whispering-Gallery-Mode Lasers Based on Self-Assembled Organic Single-Crystalline Microrings
- Author
-
Yingying Liu, Yongjun Li, Yong Sheng Zhao, Yuanchao Lv, Xiao Xiong, and Jiannian Yao
- Subjects
Organic laser ,Materials science ,business.industry ,Mechanical Engineering ,Bioengineering ,02 engineering and technology ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Laser ,Self assembled ,law.invention ,law ,Optoelectronics ,General Materials Science ,Whispering-gallery wave ,Photonics ,0210 nano-technology ,business ,Lasing threshold ,Nanoscopic scale - Abstract
The outcoupling of whispering-gallery-mode (WGM) lasers is crucial for the realization of various photonic functionalities, yet present material structures still suffered the unexpected surface damages or contaminations in the multistep micro/nanofabrications. Here, we propose a strategy to achieve controlled outcoupling of WGM lasers in self-assembled organic single-crystalline microrings. The microrings with molecular-smooth surfaces functioned as organic crystalline whispering-gallery-mode microlasers with a lasing threshold of ∼14.2 μJ cm–2 and a quality factor on the order of 103 to 104. The circular self-assembly allowed us to design different derived ring-based structures toward desired outcoupling of the WGM lasers, including unidirectional laser output from wire-ring coupled structures, and single-mode lasing in double-ring coupled systems. The results would provide an alternative avenue to construct versatile organic nanoscale lasers and related components with specific photonic applications.
- Published
- 2019
38. Highly efficient InGaN green mini-size flip-chip light-emitting diodes with AlGaN insertion layer
- Author
-
Peigang Li, Xiaoyan Yi, Huanrong Li, Meng Liang, Yong Sheng Zhao, Zhelin Liu, Guole Wang, Junjie Kang, Zongbao Li, and Yonghui Zhang
- Subjects
Materials science ,Photoluminescence ,Bioengineering ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,law.invention ,law ,General Materials Science ,Spontaneous emission ,Metalorganic vapour phase epitaxy ,Electrical and Electronic Engineering ,High-resolution transmission electron microscopy ,Diode ,business.industry ,Mechanical Engineering ,General Chemistry ,021001 nanoscience & nanotechnology ,Distributed Bragg reflector ,0104 chemical sciences ,Mechanics of Materials ,Optoelectronics ,Quantum efficiency ,0210 nano-technology ,business ,Light-emitting diode - Abstract
We demonstrate highly efficient InGaN-based mini-size green light-emitting diodes (mLEDs) with AlGaN insertion layer in InGaN/GaN multiple quantum wells (MQWs) using metal organic chemical vapor deposition (MOCVD). High resolution transmission electron microscopy (HRTEM) results reveal that 'V' defects within active region can be effectively reduced by AlGaN insertion layer. Photoluminescence (PL) and time resolved photoluminescence (TRPL) results indicate an increase of radiative recombination efficiency. Very high performance 523 nm InGaN green flip-chip mLEDs (0.025 mm2) with distributed Bragg reflector (DBR) show a high external quantum efficiency (EQE) of 38.0%, a high wall-plug efficiency (WPE) of 32.1% and a low forward voltage of 2.8 V at a working current density of 20 A cm-2, which are very promising for display application.
- Published
- 2018
39. Tuning the Solid State Emission of the Carbazole and Cyano-Substituted Tetraphenylethylene by Co-Crystallization with Solvents
- Author
-
Xiang Hao, Yishi Wu, Xue-Dong Wang, Yuancheng Wang, Hongbing Fu, Guanxin Zhang, Deqing Zhang, Wei Zhang, Tongling Liang, and Yong Sheng Zhao
- Subjects
Materials science ,Carbazole ,02 engineering and technology ,General Chemistry ,Tetraphenylethylene ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,Amorphous solid ,law.invention ,Biomaterials ,Crystal ,chemistry.chemical_compound ,chemistry ,law ,Molecule ,General Materials Science ,Crystallization ,0210 nano-technology ,Tetrahydrofuran ,Biotechnology ,Dichloromethane - Abstract
Solid state emissive materials with high quantum yields and tunable emissions are desirable for various applications. A new TPE derivative (1) with two carbazole moieties and two cyano groups is reported, which shows typical aggregation induced emission behavior. Four crystals 1a, 1b, 1c, and 1d are obtained after crystallization from N,N-dimethylformamid (DMF), trichloromethane (CHCl3 ), tetrahydrofuran (THF), and dichloromethane (CH2 Cl2 ), respectively. Crystal structural analyses reveal that (i) molecules of 1 co-crystallize with DMF, CHCl3 , THF, and CH2 Cl2 in 1a, 1b, 1c, and 1d, respectively, and (ii) conformations of 1 are different within 1a, 1b, 1c, and 1d, and compound 1 within crystal 1a adopts the most twisting conformation. Crystalline solids 1a, 1b, 1c, and 1d exhibit high emission quantum yields up to 0.65, but their emission colors are varied from blue to green. In comparison, the amorphous solid of 1 is yellow-emissive with emission maximum at 542 nm. Moreover, the blue- or green-emissive crystalline solids and the yellow-emissive amorphous solid can be inter-converted by the grinding of crystalline solids and exposure of the amorphous solid to vapors of appropriate solvents. It is also demonstrated that microrods of 1a, 1b, and 1d show typical optical waveguiding behavior.
- Published
- 2016
40. Photonic Applications of Metal–Dielectric Heterostructured Nanomaterials
- Author
-
Cong Wei and Yong Sheng Zhao
- Subjects
Materials science ,business.industry ,Surface plasmon ,Physics::Optics ,02 engineering and technology ,Dielectric ,Optical field ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Surface plasmon polariton ,0104 chemical sciences ,Optical phenomena ,Optoelectronics ,General Materials Science ,Photonics ,0210 nano-technology ,business ,Plasmon ,Localized surface plasmon - Abstract
Metal materials, supporting plasmon modes on their surface, can confine the optical field at deep subwavelength scale, which is desired for photonic integration. However, their intrinsic high Ohmic losses make it impossible to construct the whole circuit solely with the metal materials. Integrating the plasmonic components with dielectric materials may offer a solution to this dilemma. With outstanding active optical performance, these dielectric components not only can greatly reduce the optical losses of the entire circuits but also offer an efficient way to launch the surface plasmon polaritons through the evanescent field coupling or the direct exciton-plasmon conversion. Furthermore, the cooperative interaction between metal and dielectric materials would bring vast novel optical phenomena and functional photonic devices. In this review, the synergistic effects among metal and dielectric materials in various heterostructures as well as their related applications are highlighted. Comprehensive understanding on their synergistic interactions would offer useful guidance for the design and fabrication of the ultracompact novel optical devices.
- Published
- 2015
41. Controllable Growth of High‐Quality Inorganic Perovskite Microplate Arrays for Functional Optoelectronics
- Author
-
Yong Sheng Zhao, Yanlin Song, Kang Wang, Mingzhu Li, Zhonghao Zhou, Zhandong Huang, Xiaotian Hu, Lihong Li, Zheren Cai, and Zhenkun Gu
- Subjects
Materials science ,Fabrication ,business.industry ,Mechanical Engineering ,Nucleation ,Lead bromide ,Photodetector ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Laser ,Epitaxy ,01 natural sciences ,0104 chemical sciences ,law.invention ,Lattice mismatch ,Mechanics of Materials ,law ,Optoelectronics ,General Materials Science ,0210 nano-technology ,business ,Perovskite (structure) - Abstract
Inorganic perovskite single crystals have emerged as promising vapor-phase processable structures for optoelectronic devices. However, because of material lattice mismatch and uncontrolled nucleation, vapor-phase methods have been restricted to random distribution of single crystals that are difficult to perform for integrated device arrays. Herein, an effective strategy to control the vapor-phase growth of high-quality cesium lead bromide perovskite (CsPbBr3 ) microplate arrays with uniform morphology as well as controlled location and size is reported. By introducing perovskite seeds on substrates, intractable lattice mismatches and random nucleation barriers are surpassed, and the epitaxial growth of perovskite crystals is accurately controlled. It is further demonstrated that CsPbBr3 microplate arrays can be monolithically integrated on substrates for the fabrication of high-performance lasers and photodetectors. This strategy provides a facile approach to fabricate high-quality CsPbBr3 microplates with controllable size and location, which offers new opportunities for the scalable production of integrated optoelectronic devices.
- Published
- 2020
42. Turning Tissue Waste into High-Performance Microfiber Filters for Oily Wastewater Treatment
- Author
-
Dong Jun, Chuan-Yu Qin, Jing Bai, Yong-Sheng Zhao, and Gaoliang Wei
- Subjects
Materials science ,business.product_category ,02 engineering and technology ,engineering.material ,010402 general chemistry ,lcsh:Technology ,01 natural sciences ,Article ,Biofouling ,Contact angle ,oily wastewater ,Superhydrophilicity ,Microfiber ,oil/water separation ,General Materials Science ,lcsh:Microscopy ,lcsh:QC120-168.85 ,Resource recovery ,filter ,lcsh:QH201-278.5 ,Fouling ,lcsh:T ,antifouling ,021001 nanoscience & nanotechnology ,Pulp and paper industry ,0104 chemical sciences ,biopolymer microfiber ,lcsh:TA1-2040 ,engineering ,lcsh:Descriptive and experimental mechanics ,Sewage treatment ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,Biopolymer ,lcsh:Engineering (General). Civil engineering (General) ,0210 nano-technology ,business ,lcsh:TK1-9971 - Abstract
Developing low-cost, durable, and high-performance materials for the separation of water/oil mixtures (free oil/water mixtures and emulsions) is critical to wastewater treatment and resource recovery. However, this currently remains a challenge. In this work, we report a biopolymer microfiber assembly, fabricated from the recovery of tissue waste, as a low-cost and high-performance filter for oily wastewater treatment. The microfiber filters demonstrate superhydrophilicity (water contact angle of 28.8°, ) and underwater superoleophobicity (oil contact angle of 154.2°, ), and thus can achieve separation efficiencies of >, 96% for both free oil/water mixtures and surfactant-stabilized emulsions even in highly acidic (pH 2.2)/alkaline (pH 11.8) conditions. Additionally, the prepared microfiber filters possess a much higher resistance to oil fouling than conventional membranes when filtering emulsions, which is because the large-sized 3D interconnected channels of the filters can delay the formation of a low-porosity oil gel layer on their surface. The filters are expected to practically apply for the oily wastewater treatment and reduce the amount of tissue waste entering the environment.
- Published
- 2020
43. Supramolecular Polymer-Based Fluorescent Microfibers for Switchable Optical Waveguides
- Author
-
Kun-Xu Teng, Yong Sheng Zhao, Qing-Zheng Yang, Yu-Zhe Chen, Cai-Li Sun, Li-Ya Niu, and Zhenhua Gao
- Subjects
chemistry.chemical_classification ,Materials science ,business.product_category ,business.industry ,Supramolecular chemistry ,Pillar ,02 engineering and technology ,Pillararene ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Fluorescence ,0104 chemical sciences ,Supramolecular polymers ,Optical propagation ,chemistry ,Microfiber ,Optoelectronics ,General Materials Science ,0210 nano-technology ,business ,Ternary operation - Abstract
We report the switchable optical waveguide microfibers based on fluorescent supramolecular polymer for the first time. The pillar[5]arene-based supramolecular polymeric microfibers were prepared easily from the viscous solution of bispillar[5]arene host (bisP5A) and diphenylanthracene-derived guest (GD). The resulting microfibers act as an active optical waveguide material with long propagation distance (400 μm) and low optical propagation loss (0.01 dB/μm). When photoresponsive dithienylethene-derived guest (GDTE) was added, the resulting ternary microfibers show switchable optical waveguide by the noninvasive control of UV/vis light with negligible fatigue over four cycles. This convenient preparation method is also applied for the quadruple-hydrogen-bonded fluorescent supramolecular polymeric microfibers which imply good light propagation property with an optical loss coefficient of 0.02 dB/μm.
- Published
- 2018
44. Switchable Single-Mode Perovskite Microlasers Modulated by Responsive Organic Microdisks
- Author
-
Zhao Jinyang, Cong Wei, Yongli Yan, Yong Sheng Zhao, Zhenhua Gao, and Wei Zhang
- Subjects
Materials science ,business.industry ,Mechanical Engineering ,Single-mode optical fiber ,Nanophotonics ,Bioengineering ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Laser ,01 natural sciences ,0104 chemical sciences ,law.invention ,Filter (video) ,law ,Optoelectronics ,General Materials Science ,Photonics ,0210 nano-technology ,business ,Lasing threshold ,Microscale chemistry ,Perovskite (structure) - Abstract
Miniaturized lasers with high spectra purity and switchable output are of crucial importance for various ultracompact photonic devices. However, it still remains a great challenge to simultaneously control the wavelength and mode purity of microscale lasers due to the insensitive response of traditional materials to external stimuli. In this work, we propose a strategy to realize switchable single-mode microlasers in perovskite microwires (MWs) coupled with responsive organic microdisk cavities. The perovskite MW therein serves as an excellent laser source to deliver multiple lasing modes, while the microdisk functions as a spectral filter to achieve single-mode outcoupling. Furthermore, on account of the sensitive responsiveness of organic materials, reversible wavelength-switching of single-mode laser can be realized through adjusting the resonant modes of the microdisk cavity filter. The results will provide guidance for the rational design of nanophotonic devices with novel performances based on the characteristic of organic materials.
- Published
- 2018
45. Conjugated Polymer-Based Hybrid Nanoparticles with Two-Photon Excitation and Near-Infrared Emission Features for Fluorescence Bioimaging within the Biological Window
- Author
-
Peng Liu, Hui Ding, Xuefei Wang, Heng Liu, Fei Huang, Yishi Wu, Zhiyuan Tian, Yong Sheng Zhao, Yongli Yan, and Yanlin Lv
- Subjects
Diagnostic Imaging ,Fluorescence-lifetime imaging microscopy ,Materials science ,Fluorophore ,Cell Survival ,Polymers ,Quantum yield ,Conjugated system ,Photochemistry ,Two-photon absorption ,chemistry.chemical_compound ,Two-photon excitation microscopy ,Humans ,General Materials Science ,Absorption (electromagnetic radiation) ,Fluorescent Dyes ,Photons ,Spectroscopy, Near-Infrared ,business.industry ,Absorption, Radiation ,Fluorescence ,Dynamic Light Scattering ,Spectrometry, Fluorescence ,chemistry ,Nanoparticles ,Optoelectronics ,business ,HeLa Cells - Abstract
Hybrid fluorescent nanoparticles (NPs) capable of fluorescing near-infrared (NIR) light (centered ∼730 nm) upon excitation of 800 nm laser light were constructed. A new type of conjugated polymer with two-photon excited fluorescence (TPEF) feature, P-F8-DPSB, was used as the NIR-light harvesting component and the energy donor while a NIR fluorescent dye, DPA-PR-PDI, was used as the energy acceptor and the NIR-light emitting component for the construction of the fluorescent NPs. The hybrid NPs possess δ value up to 2.3 × 10(6) GM per particle upon excitation of 800 nm pulse laser. The excellent two-photon absorption (TPA) property of the conjugated polymer component, together with its high fluorescence quantum yield (ϕ) up to 45% and the efficient energy transfer from the conjugated polymer to NIR-emitting fluorophore with efficiency up to 90%, imparted the hybrid NPs with TPEF-based NIR-input-NIR-output fluorescence imaging ability with penetration depth up to 1200 μm. The practicability of the hybrid NPs for fluorescence imaging in Hela cells was validated.
- Published
- 2015
46. Highly Solid-State Emissive Pyridinium-Substituted Tetraphenylethylene Salts: Emission Color-Tuning with Counter Anions and Application for Optical Waveguides
- Author
-
Fang Hu, Yong Sheng Zhao, Guanxin Zhang, Hongbing Fu, Deqing Zhang, Yongli Yan, Chi Zhan, and Wei Zhang
- Subjects
Light ,Chemistry ,Analytical chemistry ,Solid-state ,Color ,Pyridinium Compounds ,Equipment Design ,General Chemistry ,Crystal structure ,Tetraphenylethylene ,Ethylenes ,Surface Plasmon Resonance ,Photochemistry ,Fluorescence ,Amorphous solid ,Equipment Failure Analysis ,Biomaterials ,Refractometry ,chemistry.chemical_compound ,Materials Testing ,Scattering, Radiation ,Salts ,General Materials Science ,Pyridinium ,Biotechnology - Abstract
In this paper seven salts of pyridinium-substituted tetraphenylethylene with different anions are reported. They show typical aggregation-induced emission. Crystal structures of three of the salts with (CF(3)SO(2))(2) N(-), CF(3) SO(3)(-), and SbF(6)(-) as the respective counter anions, are determined. The emission behavior of their amorphous and crystalline solids is investigated. Both amorphous and crystalline solids, except for the one with I(-), are highly emissive. Certain amorphous solids are red-emissive with almost the same quantum yields and fluorescence life-times. However, some crystalline solids are found to show different emission colors varying from green to yellow. Thus, their emission colors can be tuned by the counter anions. Furthermore, certain crystalline solids are highly emissive compared to the respective amorphous solids. Such solid-state emission behavior of these pyridinium-substituted tetraphenylethylene salts is interpreted on the basis of their crystal structures. In addition, optical waveguiding behavior of fabricated microrods is presented.
- Published
- 2014
47. Wavelength Division Multiplexer Based on Semiconductor Heterostructures Constructed via Nanoarchitectonics
- Author
-
Kang Wang, Yong Sheng Zhao, Yongli Yan, Jian Ye, and Jiannian Yao
- Subjects
Materials science ,business.industry ,Optical communication ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Signal ,Multiplexer ,0104 chemical sciences ,Biomaterials ,Semiconductor ,Wavelength-division multiplexing ,Nanoarchitectonics ,Optoelectronics ,General Materials Science ,Photonics ,0210 nano-technology ,business ,Lasing threshold ,Biotechnology - Abstract
Obtaining a wavelength division multiplexer (WDM) at the micro/nanometer level is a considerable challenge that holds great potential in optical communication technology owing to the enlarged data-carrying capacity without laying more fibers. Of the progress that has been made in recent years, one of the most promising methods is to fabricate nanoscale pattern on silicon substrate, forcing signals of different wavelength to enter predesigned channels due to the alternant changes in refractive index. However, it is not an easy task to incorporate light sources into these WDM systems, because of the nonradiative characteristics of silicon itself. This study demonstrates a successful integration of laser signal sources and WDM fully with 1D semiconductor structures. Nanowires from II-VI semiconductor serve as both lasing media and low-loss waveguides for signal loading and delivering, respectively. On the basis of the distinct size-dependent cut-off effect, finely tuning the diameters of homojunctions would result in a controllable filtering of confined signal that light, beyond cut-off wavelength, cannot transfer within the narrowed segments any longer. These results pave the way for semiconductor photonic components toward integration.
- Published
- 2017
48. Covert Photonic Barcodes Based on Light Controlled Acidichromism in Organic Dye Doped Whispering-Gallery-Mode Microdisks
- Author
-
Cong Wei, Chunhuan Zhang, Jun Yi, Zhenhua Gao, Yongli Yan, Yongjun Li, Yong Sheng Zhao, Zhao Jinyang, Wei Zhang, and Haiyun Dong
- Subjects
3D optical data storage ,Materials science ,business.industry ,Mechanical Engineering ,Small footprint ,Doping ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Multiplexing ,0104 chemical sciences ,Mechanics of Materials ,Organic dye ,Optoelectronics ,General Materials Science ,Photonics ,Whispering-gallery wave ,0210 nano-technology ,business - Abstract
Photonic barcodes with a small footprint have demonstrated a great value for multiplexed high-throughput bioassays and tracking systems. Attempts to develop coding technology tend to focus on the generation of featured barcodes both with high coding capacity and accurate recognition. In this work, a strategy to design photonic barcodes is proposed based on whispering-gallery-mode (WGM) modulations in dye-doped microdisk resonant cavities, where each modulated photoluminescence spectrum constitutes the fingerprint of a corresponding microdisk. The WGM-based barcodes can achieve infinite encoding capacity through tuning the dimensions of the microdisks. These photonic barcodes can be well disguised and decoded based on the light controlled proton release and acidichromism of the organic materials, which are essential to fulfill the functions of anti-counterfeiting, information security, and so on. The results will pave an avenue to new types of flexible WGM-based components for optical data recording and security labels.
- Published
- 2017
49. A Single Crystal with Multiple Functions of Optical Waveguide, Aggregation-Induced Emission, and Mechanochromism
- Author
-
Aisen Li, Yong Sheng Zhao, Zhiyong Ma, Xinru Jia, Yan Li, Kang Wang, Hong Jiang, Yue-Chao Wang, and Weiqing Xu
- Subjects
Materials science ,business.industry ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Molecular conformation ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Yield (chemistry) ,Rhodamine B ,Moiety ,Pyrene ,Optoelectronics ,General Materials Science ,Aggregation-induced emission ,0210 nano-technology ,business ,Single crystal ,Crucial point - Abstract
A novel single crystal, PyB, is produced in a high yield by the simple method of connecting a pyrene unit and a rhodamine B moiety together. PyB shows multiple functions of aggregation-induced emission, low-loss optical waveguiding, and tricolored mechanochromism. The crucial point for fabricating such a multifunctional single crystal is selecting the C═N group as a spacer, which simplifies the synthetic procedure, confines the molecular conformation to develop single crystals, and allows one to dynamically observe the color variation in situ and quantitatively analyze the effect of applied pressures. Such a simple approach may be extended to other fluorophores, thus providing a new opportunity for the real world application of mechanochromic materials for mechanical sensors, optical encoding, and optoelectronic devices, etc.
- Published
- 2017
50. Polymorph-Dependent Electrogenerated Chemiluminescence of Low-Dimensional Organic Semiconductor Structures for Sensing
- Author
-
Bin Wen, Wei Zhang, Qing Li, Faming Gao, Jianmin Gu, Jingxiao Wu, Aixue Li, Yong Sheng Zhao, Haiyun Dong, and Yahui Gao
- Subjects
Supersaturation ,Materials science ,02 engineering and technology ,Crystal structure ,Triclinic crystal system ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,law.invention ,Organic semiconductor ,chemistry.chemical_compound ,chemistry ,law ,Molecule ,General Materials Science ,0210 nano-technology ,Rubrene ,Chemiluminescence ,Monoclinic crystal system - Abstract
A sensitive electrogenerated chemiluminescence (ECL) sensor with an organic semiconductor as active material for detecting trace amounts of molecules has been highly desired. However, the crystal structure responses of the ECL properties of the organic semiconductor materials, that is, structure-property relationship, is not clear, which limits the development of the sensitive ECL sensors. Herein, for the first time, we reported a novel concept for molecular-stacking-arrangement-dependent electrogenerated chemiluminescence properties of organic semiconductor rubrene microstructures. The rubrene 1D microwires and 2D hexagonal plates with different polymorphs (triclinic and monoclinic) were controllably constructed with the reprecipitation method. The supersaturation of the rubrene molecules plays an important role in the thermodynamically and kinetically dominated process of growth, which affects not only the polymorphs but also the morphology of the obtained microstructures. These microstructures show good optoelectronic properties, which are used as active ECL materials for the construction of ECL sensors. The ECL sensors exhibited distinct electrogenerated chemiluminescence properties, probably related to different inherent crystal-structure-dependent triplet-triplet annihilation rate and charge-transfer rate. The sensors manifested electrogenerated chemiluminescence responses in broad linear range for the monitoring of creatinine molecules.
- Published
- 2017
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