445 results on '"Yong Sheng Zhao"'
Search Results
2. Dual-stimuli responsive photonic barcodes based on perovskite quantum dots encapsulated in whispering-gallery-mode microspheres
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Baoyuan Xu, Shuo Yang, Xingwei Feng, Tongjin Zhang, Zhenhua Gao, and Yong Sheng Zhao
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Responsive photonic barcodes ,Perovskite quantum dots ,Whispering-gallery-mode microsphere ,Anti-counterfeiting ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Micro/nanoscale photonic barcodes hold great potential for broad applications in items tracking, multiplexed bioassays and anti-counterfeiting. The ever-increasing demand in advanced anti-counterfeiting applications calls for micro/nanoscale barcodes with accurate recognition, large encoding capacity and high security level. Here, we proposed a strategy to construct the dual-stimuli responsive photonic barcodes based on the perovskite quantum dots (PQDs) doped polymer whispering-gallery-mode (WGM) microcavities via swelling-deswelling method. Benefiting from the well-defined spherical microcavities, the photoluminescence (PL) spectra of as-prepared composites exhibit a series of sharp peaks characteristics resulting from the effective WGM modulation, which constitutes the fingerprint of a specific resonator and thus allows a definition of photonic barcodes. On this basis, we achieved responsive photonic barcodes based on the volatile polar-solvent-controlled luminescence in the microspheres benefitting from the space-confined microcavities and the ionic feature of the PQDs. Moreover, the light-controlled photonic barcodes have further been acquired through reversibly regulating the inactivation and activation of the energy transfer (ET) process between the PQDs and photochromic dyes. The well-established protocols of PQDs@WGM enable the development of distinct responsive barcodes with multi-responsive features, which will pave an avenue to new types of flexible WGM-based components for optical data recording and security labels.
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- 2023
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3. Organic donor-acceptor heterojunctions for high performance circularly polarized light detection
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Danlei Zhu, Wei Jiang, Zetong Ma, Jiajing Feng, Xiuqin Zhan, Cheng Lu, Jie Liu, Yuanyuan Hu, Dong Wang, Yong Sheng Zhao, Jianpu Wang, Zhaohui Wang, and Lang Jiang
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Science - Abstract
Here, the authors report a strategy to fabricate multi-wavelength circularly polarized light photodetectors consisting of bilayer donor-acceptor heterojunctions with chiral active layers.
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- 2022
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4. Room temperature exciton–polariton Bose–Einstein condensation in organic single-crystal microribbon cavities
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Ji Tang, Jian Zhang, Yuanchao Lv, Hong Wang, Fa Feng Xu, Chuang Zhang, Liaoxin Sun, Jiannian Yao, and Yong Sheng Zhao
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Science - Abstract
The use of room temperature exciton–polariton Bose–Einstein condensation is limited by the need for external high-finesse microcavities. The authors generate room temperature EPs with single-crystal microribbons as waveguide Fabry–Pérot microcavities, and demonstrate controllable output of coherent light.
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- 2021
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5. Chiral Hybrid Perovskite Single‐Crystal Nanowire Arrays for High‐Performance Circularly Polarized Light Detection
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Zhen Liu, Chunhuan Zhang, Xiaolong Liu, Ang Ren, Zhonghao Zhou, Chan Qiao, Yuwei Guan, Yuqing Fan, Fengqin Hu, and Yong Sheng Zhao
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chiral hybrid perovskites ,circularly polarized light detection ,nanowire arrays ,perovskite nanowires ,perovskite photodetectors ,Science - Abstract
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.
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- 2021
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6. Organic composite materials: Understanding and manipulating excited states toward higher light‐emitting performance
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Haiyun Dong, Chunhuan Zhang, Jiannian Yao, and Yong Sheng Zhao
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excited states ,molecular optoelectronics ,organic composite materials ,organic lasers ,organic light‐emitting materials ,Chemistry ,QD1-999 ,Biology (General) ,QH301-705.5 - Abstract
Abstract Organic composite materials have been attracting extensive research interest for light‐emitting applications. A wide variety of luminescent organic composite materials have been synthesized, which are of great significance for both the investigation of basic photophysics and the realization of high‐performance photonic devices. Function‐oriented syntheses of luminescent organic composite materials rely on the understanding and manipulating of molecular excited states. In this review, we focus on the discussion about the structure design and dynamics modulation of the electronic excited states in the organic composite materials. The excited‐state structures and dynamics involve singlet/triplet levels, vibronic transition, charge transfer, and energy transfer, and so on, while the light‐emitting behaviors include fluorescence, phosphorescence, persistent luminescence, electroluminescence, and lasing. We aim to give insight into the relationship between light‐emitting properties and excited states of organic composite materials, which is beneficial for reaching higher tiers of design and applications of luminescent organic composite materials.
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- 2021
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7. Full-color laser displays based on organic printed microlaser arrays
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Jinyang Zhao, Yongli Yan, Zhenhua Gao, Yuxiang Du, Haiyun Dong, Jiannian Yao, and Yong Sheng Zhao
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Science - Abstract
In the next generation of display technology for portable devices, lasers could replace LEDs to achieve more vibrant colours. Here, Zhao et al. demonstrate a dynamic full-color display in which each pixel is made up of three printed organic microlasers to cover the RGB space.
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- 2019
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8. Wavelength-Tunable Single-Mode Microlasers Based on Photoresponsive Pitch Modulation of Liquid Crystals for Information Encryption
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Fa-Feng Xu, Zhong-Liang Gong, Yu-Wu Zhong, Jiannian Yao, and Yong Sheng Zhao
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Science - Abstract
Information encryption and decryption have attracted particular attention; however, the applications are frequently restricted by limited coding capacity due to the indistinguishable broad photoluminescence band of conventional stimuli-responsive fluorescent materials. Here, we present a concept of confidential information encryption with photoresponsive liquid crystal (LC) lasing materials, which were used to fabricate ordered microlaser arrays through a microtemplate-assisted inkjet printing method. LC microlasers exhibit narrow-bandwidth single-mode emissions, and the wavelength of LC microlasers was reversibly modulated based on the optical isomerization of the chiral dopant in LCs. On this basis, we demonstrate phototunable information authentication on LC microlaser arrays using the wavelength of LC microlasers as primary codes. These results provide enlightenment for the implementation of microlaser-based cryptographic primitives for information encryption and anticounterfeiting applications.
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- 2020
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9. Hybrid Three-Dimensional Spiral WSe2 Plasmonic Structures for Highly Efficient Second-Order Nonlinear Parametric Processes
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Xianqing Lin, Yingying Liu, Kang Wang, Xiaolong Liu, Yongli Yan, Yong Jun Li, Jiannian Yao, and Yong Sheng Zhao
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Science - Abstract
Two-dimensional (2D) layered materials, with large second-order nonlinear susceptibility, are currently growing as an ideal candidate for fulfilling tunable nanoscale coherent light through the second-order nonlinear optical parametric processes. However, the atomic thickness of 2D layered materials leads to poor field confinement and weak light-matter interaction at nanoscale, resulting in low nonlinear conversion efficiency. Here, hybrid three-dimensional (3D) spiral WSe2 plasmonic structures are fabricated for highly efficient second harmonic generation (SHG) and sum-frequency generation (SFG) based on the enhanced light-matter interaction in hybrid plasmonic structures. The 3D spiral WSe2, with AA lattice stacking, exhibits efficient SH radiation due to the constructive interference of nonlinear polarization between the neighboring atomic layers. Thus, extremely high external SHG conversion efficiency (about 2.437×10−5) is achieved. Moreover, the ease of phase-matching condition combined with the enhanced light-matter interaction in hybrid plasmonic structure brings about efficient SHG and SFG simultaneously. These results would provide enlightenment for the construction of typical structures for efficient nonlinear processes.
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- 2018
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10. Revealing molecular diffusion dynamics in polymer microspheres by optical resonances
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Jiawei Wang, Jin Li, Shengqi Sun, Haiyun Dong, Lan Wu, Engui Zhao, Feng He, Xing Ma, and Yong Sheng Zhao
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Multidisciplinary - Abstract
Understanding the diffusion of small molecules in polymer microsystems is of great interest in diverse fundamental and industrial research. Despite the rapidly advancing optical imaging and spectroscopic techniques, entities under investigation are usually limited to flat films or bulky samples. We demonstrate a route to in situ detection of diffusion dynamics in polymer micro-objects by means of optical whispering-gallery mode resonances. Through mode tracking, interactions between solvent molecules and polymer microspheres, including sorption, diffusion, and swelling can be quantitatively analyzed. A turning point of mode response is observed, while the diffusion exceeds the sub-wavelength-thick outermost layer as the radial extent of resonances and starts penetrating the inner core. The estimated solubility in the glassy polymer is consistent with the predicted value using Flory-Huggins theory. Besides, the non-Fickian contribution is analyzed in such a glassy polymer-penetrant system. Our work represents a high-precision and label-free approach to describing characteristics in diffusion dynamics.
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- 2023
11. Programmable assembly of multiple donor-acceptor systems in metal-organic framework for heterogeneity manipulation and functions integration
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Xiao-Ting Liu, Bin-Bin Qian, Tongjin Zhang, Hong-Xiang Nie, Nan-Nan Xiao, Hao-Yang Shi, Ze Chang, Yong Sheng Zhao, and Xian-He Bu
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General Materials Science - Published
- 2022
12. Realization of Single-Crystal Dye Lasers by Taming Charge Transfer in Molecular Self-Assemblies
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Wanting Dong, Chunhuan Zhang, Haiyun Dong, Zhonghao Zhou, Jiannian Yao, and Yong Sheng Zhao
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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.
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- 2022
13. Highly Luminescent Zero-Dimensional Organic Copper Halide with Low-Loss Optical Waveguides and Highly Polarized Emission
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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
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General Chemical Engineering ,Biomedical Engineering ,General Materials Science - Published
- 2022
14. Bubble wall confinement–driven molecular assembly toward sub–12 nm and beyond precision patterning
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Zhiyuan Qu, Peng Zhou, Fanyi Min, Shengnan Chen, Mengmeng Guo, Zhandong Huang, Shiyang Ji, Yongli Yan, Xiaodong Yin, Hanqiu Jiang, Yubin Ke, Yong Sheng Zhao, Xuehai Yan, Yali Qiao, and Yanlin Song
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Multidisciplinary - Abstract
Patterning is attractive for nanofabrication, electron devices, and bioengineering. However, achieving the molecular-scale patterns to meet the demands of these fields is challenging. Here, we propose a bubble-template molecular printing concept by introducing the ultrathin liquid film of bubble walls to confine the self-assembly of molecules and achieve ultrahigh-precision assembly up to 12 nanometers corresponding to the critical point toward the Newton black film limit. The disjoining pressure describing the intermolecular interaction could predict the highest precision effectively. The symmetric molecules exhibit better reconfiguration capacity and smaller preaggregates than the asymmetric ones, which are helpful in stabilizing the drainage of foam films and construct high-precision patterns. Our results confirm the robustness of the bubble template to prepare molecular-scale patterns, verify the criticality of molecular symmetry to obtain the ultimate precision, and predict the application potential of high-precision organic patterns in hierarchical self-assembly and high-sensitivity sensors.
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- 2023
15. 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
16. Photoisomerization-controlled wavelength-tunable plasmonic lasers
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Shuang Wen, Wu Zhou, Zhiyuan Tian, Yongli Yan, and Yong Sheng Zhao
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Materials Chemistry ,Metals and Alloys ,Ceramics and Composites ,General Chemistry ,Catalysis ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials - Abstract
The change of refractive index resulting from the isomerization of photochromic molecules under light irradiation reconfigures lattice plasmon resonances, which allows for the realization of dynamically and continuously tunable plasmonic lasers.
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- 2023
17. Magnetic-Field-Driven Reconfigurable Microsphere Arrays for Laser Display Pixels
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Baipeng Yin, Hao Jia, Hong Wang, Rui Chen, Lixin Xu, Yong Sheng Zhao, Chuang Zhang, and Jiannian Yao
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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.
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- 2022
18. Defect engineering in two-dimensional perovskite nanowire arrays by europium(<scp>iii</scp>) doping towards high-performance photodetection
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Yuwei Guan, Jie Liang, Yiman Zhao, Zhen Liu, Zhonghao Zhou, Shiyang Ji, Yajun Jia, Fengqin Hu, and Yong Sheng Zhao
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Materials Chemistry ,Metals and Alloys ,Ceramics and Composites ,General Chemistry ,Catalysis ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials - Abstract
We demonstrate high-performance photodetectors based on Eu-doped 2D perovskite nanowire arrays. The pure crystallographic orientation enables efficient carrier transport and the doped Eu ions effectively suppress the trap density in the nanowire arrays. As a result, the optimized Eu-doped photodetectors show an excellent responsivity of 6.24 A W
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- 2022
19. Accumulating bright excitons on the hybridized local and charge transfer excited state for organic semiconductor lasers
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Rui Chen, Wu Zhou, Yanjun Gong, Zeyang Zhou, Hong Wang, Chenghu Dai, Yong Sheng Zhao, Yanke Che, Chuang Zhang, and Jiannian Yao
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Materials Chemistry ,General Chemistry - Abstract
The hybridization of local and charge transfer excited states is proven to accumulate bright excitons for both optically pumped lasing and electroluminescence at high current density.
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- 2022
20. An Optically Reconfigurable Förster Resonance Energy Transfer Process for Broadband Switchable Organic Single-Mode Microlasers
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Zhonghao Zhou, Yong Sheng Zhao, Jiannian Yao, Chunhuan Zhang, and Chan Qiao
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Materials science ,Organic laser ,business.industry ,Single-mode optical fiber ,Resonance ,General Chemistry ,Laser ,law.invention ,Förster resonance energy transfer ,law ,Broadband ,Optoelectronics ,Photonics ,business ,Spectral purity - Abstract
Miniaturized lasers with multicolor output and high spectral purity are indispensable for various ultracompact photonic devices. Here, we propose an optically reconfigurable Forster resonance energ...
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- 2022
21. Exciton funneling amplified photoluminescence anisotropy in organic radical-doped microcrystals
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Yong Sheng Zhao, Chan Qiao, Yongli Yan, Zhonghao Zhou, and Jiannian Yao
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Photoluminescence ,Materials science ,Condensed Matter::Other ,business.industry ,Exciton ,Doping ,Physics::Optics ,General Chemistry ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,Condensed Matter::Materials Science ,Physics::Atomic and Molecular Clusters ,Materials Chemistry ,Optoelectronics ,Anisotropy ,Luminescence ,business - Abstract
We demonstrate a controllable photoluminescence anisotropy amplification in organic luminescent radical-doped microcrystals via exciton funneling. The widely tunable doping ratio resulting from very similar molecular structures between hosts and guests leads to a freely tailorable exciton funneling process, which paves an avenue for the construction of high-performance polarizing optical elements.
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- 2022
22. Screen-Overprinted Perovskite RGB Microdisk Arrays Based on Wet-Solute-Chemical Dynamics for Full-Color Laser Displays
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Jie Liang, Kang Wang, Yuxiang Du, Chunhuan Zhang, Yongli Yan, and Yong Sheng Zhao
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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
23. Framework-Shrinkage-Induced Wavelength-Switchable Lasing from a Single Hydrogen-Bonded Organic Framework Microcrystal
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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
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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
24. Frontiers in circularly polarized luminescence: molecular design, self-assembly, nanomaterials, and applications
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Yixiang Cheng, You-Xuan Zheng, Zhonghao Zhou, Pengfei Duan, Jianping Deng, Minghua Liu, Mingjian Yuan, Hua Kuang, Yi-Pin Zhang, Zhong-Liang Gong, Shuang-Quan Zang, Xuefeng Zhu, Biao Zhao, Si-Wei Zhang, Yu-Wu Zhong, Yong Sheng Zhao, Ben Zhong Tang, Chuan-Feng Chen, and Dong Yang
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chemistry.chemical_classification ,Materials science ,chemistry ,Liquid crystal ,Supramolecular chemistry ,Nanotechnology ,General Chemistry ,Polymer ,Self-assembly ,Luminescence ,Photon upconversion ,Circular polarization ,Nanomaterials - Abstract
The research in circularly polarized luminescence has attracted wide interest in recent years. Efforts on one side are directed toward the development of chiral materials with both high luminescence efficiency and dissymmetry factors, and on the other side, are focused on the exploitations of these materials in optoelectronic applications. This review summarizes the recent frontiers (mostly within five years) in the research in circularly polarized luminescence, including the development of chiral emissive materials based on organic small molecules, compounds with aggregation-induced emissions, supramolecular assemblies, liquid crystals and liquids, polymers, metal-ligand coordination complexes and assemblies, metal clusters, inorganic nanomaterials, and photon upconversion systems. In addition, recent applications of related materials in organic light-emitting devices, circularly polarized light detectors, and organic lasers and displays are also discussed.
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- 2021
25. Nonconfinement growth of edge-curved molecular crystals for self-focused microlasers
- Author
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Baipeng Yin, Jie Liang, Jinjie Hao, Chenghu Dai, Hao Jia, Hong Wang, Desong Wang, Fang-Jie Shu, Chuang Zhang, Jianmin Gu, and Yong Sheng Zhao
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Multidisciplinary - Abstract
Synthesis of single-crystalline micro/nanostructures with curved shapes is essential for developing extraordinary types of optoelectronic devices. Here, we use the strategy of liquid-phase nonconfinement growth to controllably synthesize edge-curved molecular microcrystals on a large scale. By varying the molecular substituents on linear organic conjugated molecules, it is found that the steric hindrance effect could minimize the intrinsic anisotropy of molecular stacking, allowing for the exposure of high-index crystal planes. The growth rate of high-index crystal planes can be further regulated by increasing the molecular supersaturation, which is conducive to the cogrowth of these crystal planes to form continuously curved-shape microcrystals. Assisted by nonrotationally symmetric geometry and optically smooth curvature, edge-curved microcrystals can support low-threshold lasing, and self-focusing directional emission. These results contribute to gaining an insightful understanding of the design and growth of functional molecular crystals and promoting the applications of organic active materials in integrated photonic devices and circuits.
- Published
- 2022
26. Effect of Dynamic Micro Vortex Generator on Corner Shock Wave Boundary Layer Interactions Based on DES
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Yong-sheng Zhao, Jun-fei Wu, and Jian Zhou
- Published
- 2022
27. Full-color flexible laser displays based on random laser arrays
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Chunhuan Zhang, Fa Feng Xu, Ji Tang, Yue Hou, Yong Sheng Zhao, Zhonghao Zhou, and Yuqing Fan
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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
28. Simulating the Structure of Carbon Dots via Crystalline π‐Aggregated Organic Nanodots Prepared by Kinetically Trapped Self‐Assembly
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Jianye Yang, Like Guo, Xue Yong, Tongjin Zhang, Boyang Wang, Haoqiang Song, Yong Sheng Zhao, Hongwei Hou, Bai Yang, Jie Ding, and Siyu Lu
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General Chemistry ,General Medicine ,Catalysis - Abstract
This work reports the successful preparation of a new type of crystalline luminescent organic nanodot (3.5 nm) by kinetically trapped self-assembly, which is then used as a simplified π-packing model to simulate the structure of CDs. The precise structure and J-aggregation-induced photoluminescence (PL) of the nanodots are revealed by investigating the structural relationship between the nanodots and the corresponding single crystals and their properties. Compared with the single crystals, crystalline organic nanodots show longer PL lifetime, higher PL quantum yield, and narrower PL peak, indicating that they are potential organic quantum nanodots. In addition, the efficient π-stacking environment in the corresponding single crystals can promote π-aggregation-induced PL anisotropy. This work indicates crystalline organic nanodots with precise structures to be potentially useful for understanding the structures of CDs and to be attractive potential luminescent materials.
- Published
- 2022
29. Energy‐Controllable Exciton‐Polariton Bose–Einstein Condensation in Perovskite Microstrip Cavities
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Ang Ren, Ji Tang, Zhengjun Jiang, Yongli Yan, Jiannian Yao, and Yong Sheng Zhao
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Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2022
30. Evolutionary trends in human mandibles and dentition from Neolithic to current Chinese
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Meng Chen Xu, Jin-Sun Jeong, Zhao Hui Chen, Hiran Perinpanayagam, Cong Rui Liu, Yong Sheng Zhao, Fen Wang, Hui Fang, Kee-Yeon Kum, and Yu Gu
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Adult ,China ,Otorhinolaryngology ,Tooth, Impacted ,Dentition ,Humans ,Molar, Third ,Cell Biology ,General Medicine ,Mandible ,Cone-Beam Computed Tomography ,General Dentistry - Abstract
This study aimed to systematically compare Neolithic mandibles and dentition with modern Chinese, and thereby discern human evolutionary trends.Neolithic remains of 45 adults unearthed at the Zhangqiu Jiaojia site, were compared with clinical records of 48 patients at Shandong University. All samples were scanned by cone beam computed tomography (CBCT) using identical parameters. Digital imaging and communications in medicine images were collected, three-dimensional models reconstructed, and morphology measurements obtained using Mimics software.Neolithic mandibles were significantly larger in their vertical and sagittal dimensions (P .05), but similar in horizontal width to modern humans. Their condyles had fewer bird beak and crooked finger shaped morphologies than modern mandibles (P .05). Neolithic third molars were more often erupted than in modern mandibles, and their Position A, class I and II, and vertical impactions were more common (P .05). Neolithic teeth were generally smaller in crown lengths and in cross-sectional areas, than their modern counterparts (P .05).Neolithic mandibles were larger than modern humans, who have refined diets and mandibular atrophy. They had fewer abnormally shaped condylar morphologies, and much fewer third molar impactions than in modern humans. However, modern dentition particularly their crowns are larger, likely through genetic influx from migrations.
- Published
- 2022
31. Coupled dynamic response analysis of multi-column floating offshore wind turbine with low center of gravity
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Jie Yang, Yan-ping He, Yong-sheng Zhao, Xiao-yan Yang, and Guo-rong Zhang
- Subjects
Environmental Engineering ,Ocean Engineering ,Oceanography - Published
- 2022
32. 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
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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
33. Responsive Liquid‐Crystal Microlaser Arrays with Tactile Perception
- Author
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Wu Zhou, Chunhuan Zhang, Ang Ren, Haiyun Dong, Jiannian Yao, and Yong Sheng Zhao
- Subjects
Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2023
34. Dynamical Fluid Control Model on Fuzzy Control.
- Author
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Li-hua Song and Yong-sheng Zhao
- Published
- 2008
- Full Text
- View/download PDF
35. Organic Microlaser Arrays: From Materials Engineering to Optoelectronic Applications
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Yong Sheng Zhao, Jie Liang, and Yongli Yan
- Subjects
Materials science ,Polymers and Plastics ,business.industry ,law ,Materials Science (miscellaneous) ,Materials Chemistry ,Chemical Engineering (miscellaneous) ,Optoelectronics ,Photonics ,business ,Laser ,law.invention - Abstract
ConspectusIn the past decade, micro/nanoscale lasers have captured broad research interest for their feasibility in advancing the fields of photonics and optoelectronics. Owing to ease of spectral ...
- Published
- 2021
36. Smart Protein-Based Biolasers: An Alternative Way to Protein Conformation Detection
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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
37. Topological‐Distortion‐Driven Amorphous Spherical Metal‐Organic Frameworks for High‐Quality Single‐Mode Microlasers
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Xue Wang, Shunwei Chen, Weiguang Zhang, Tongjin Zhang, Zifei Wang, Xun Sun, Shuo Yang, Yuqing Fan, Yanhui Wei, Baoyuan Xu, Zhenhua Gao, Yong Sheng Zhao, and Xiangeng Meng
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Materials science ,010405 organic chemistry ,Scattering ,business.industry ,Single-mode optical fiber ,Physics::Optics ,General Medicine ,General Chemistry ,010402 general chemistry ,Topology ,01 natural sciences ,Catalysis ,Microsphere ,0104 chemical sciences ,Amorphous solid ,Quality (physics) ,Q factor ,Distortion ,Optoelectronics ,Photonics ,Whispering-gallery wave ,business ,Lasing threshold - Abstract
Metal-organic frameworks (MOFs) have recently emerged as appealing platforms to construct microlasers owing to their compelling characters combining the excellent stability of inorganic materials and processable characters of organic materials. However, MOF microstructures developed thus far are generally composed of multiple edge boundaries due to their crystalline nature, which consequently raises significant scattering losses that are detrimental to lasing performance. In this work, we propose a strategy to overcome the above drawback by designing spherically shaped MOFs microcavities. Such spherical MOF microstructures are constructed by amorphizing MOFs with a topological distortion network through introducing flexible building blocks into the growth environment. With an ultra-smooth surface and excellent circular boundaries, the acquired spherical microcavities possess a Q factor as high as ≈104 and can provide sufficient feedback for high-quality single-mode lasing oscillations. We hope that these results will pave an avenue for the construction of new types of flexible MOF-based photonic components.
- Published
- 2021
38. Dynamics of Internet Congestion Control Algorithm with Communication Delays.
- Author
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Hongyong Yang, Yong-sheng Zhao, and Fusheng Wang 0002
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- 2006
- Full Text
- View/download PDF
39. [Analysis of early and middle stage efficacy and complications of oblique lumbar interbody fusion in treating degenerative lumbar diseases]
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Yong-Sheng, Zhao, Qiang, Li, Yang, Wang, and Cheng-Shao, Zhang
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Male ,Lumbar Vertebrae ,Spinal Fusion ,Treatment Outcome ,Humans ,Female ,Middle Aged ,Spondylolisthesis ,Aged ,Retrospective Studies - Abstract
To investigate the early and middle stage efficacy and complications of minimally invasive extraperitoneal oblique lumbar interbody fusion (OLIF) in the treatment of degenerative lumbar diseases.The clinical data of 22 patients with degenerative lumbar diseases underwent OLIF from October 2017 to March 2019 were retrospectively analyzed, including 14 males and 8 females, aged from 51 to 72 years with an average of (63.15±7.22) years. There were 6 cases of lumbar spinal stenosis, 5 cases of lumbar spondylolisthesis, 4 cases of adjacent vertebral disease, 3 cases of degenerative lumbar scoliosis, 3 cases of discogenic low back pain, and 1 case of recurrence after posterior lumbar decompression. Posterior minimally invasive pedicle screw fixation was performed in 13 cases and Stand-alone fixation in 9 cases. Intraoperative blood loss, operation time, postoperative drainage volume, landing time were recorded. The intervertebral disc height(IDH), intervertebral foramen height(IFH), intervertebral foramen area( IFA), canal diameter(CD), canal area(CA) were measured before and after operation. The imaging changes (including location of fusion cage, interbody fusion, and cage subsidence) and complications were observed. Oswestry Disability Index (ODI), numerical rating scales (NRS) and Japanese Orthopaedic Association (JOA) scores were compared before and 3, 6, 12 months after operation.All 22 patients successfully completed the operation. The intraoperative blood loss was 25 to 280 ml with an average of (95.45±79.07) ml and that of simple anterior approach was 25 to 70 ml with an average of (45.71±15.42) ml. The operation time was 75 to 210 min with an average of (137.72±37.66) min, and the simple anterior operation time was 75 to 105 min with an average of (91.40±15.96) min. The total drainage volume was 10 to 110 ml with an average of (56.23±31.15) ml, and the time to go down to the ground was 24 to 72 hours (54.48±18.24) hours after operation. Postoperative IDH improved (6.63±2.61)mm(The treatment of lumbar degenerative diseases with definite indications by OLIF can achieve satisfactory clinical results, and it has advantages of less intraoperative bleeding, fast time to land, less complications, good imaging improvement and indirect decompression. But the operation time and fluoroscopy time are longer in the early stage, and complications such as peritoneal injury and lumbar plexus over traction may occur. The long-term incidence of settlement of fusion cage with Stand-alone technology is higher.
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- 2022
40. Laser Action in Hybrid Organic–Inorganic Perovskites
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Chuang Zhang and Yong Sheng Zhao
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- 2022
41. Interfacial Chemistry Triggers Ultrafast Radiative Recombination in Metal Halide Perovskites
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Haiyun Dong, Chunhuan Zhang, Weijie Nie, Shengkai Duan, Christian N. Saggau, Min Tang, Minshen Zhu, Yong Sheng Zhao, Libo Ma, and Oliver G. Schmidt
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General Medicine ,General Chemistry ,Catalysis - Abstract
Efficient radiative recombination is essential for perovskite luminescence, but the intrinsic radiative recombination rate as a basic material property is challenging to tailor. Here we report an interfacial chemistry strategy to dramatically increase the radiative recombination rate of perovskites. By coating aluminum oxide on the lead halide perovskite, lead-oxygen bonds are formed at the perovskite-oxide interface, producing the perovskite surface states with a large exciton binding energy and a high localized density of electronic state. The oxide-bonded perovskite exhibits a ≈500 fold enhanced photoluminescence with a ≈10 fold reduced lifetime, indicating an unprecedented ≈5000 fold increase in the radiative recombination rate. The enormously enhanced radiative recombination promises to significantly promote the perovskite optoelectronic performance.
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- 2022
42. A switchable multimode microlaser based on an AIE microsphere
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Guo-Gang Shan, Yuqin Fan, Sijie Chen, Puxiang Lai, Fengyan Song, Chunhuan Zhang, Haiyun Dong, Hui Gao, Ming-Yu Wu, and Yong Sheng Zhao
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Materials science ,Multi-mode optical fiber ,Active laser medium ,business.industry ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,Fluorescence ,0104 chemical sciences ,Microsphere ,law.invention ,Wavelength ,law ,Materials Chemistry ,Optoelectronics ,Photonics ,0210 nano-technology ,business ,Preparation procedures - Abstract
Switchable multimode microlasers are of great significance to the development of photonic devices with high integration levels. Herein, we demonstrate an acid/alkaline gas-responsive multimode AIEgen@starch microsphere-based microlaser. The aggregation-induced emission (AIE) active fluorescent dye ASCPI was used as the gain medium in this study. ASCPI was weakly emissive in water but became highly emissive when introduced to a starch microsphere as a guest molecule. The resultant ASCPI@starch microsphere worked well as a typical whispering-gallery-mode microlaser. The laser mode wavelengths were size-dependent. Due to the sensitivity of ASCPI to pH, the output of the microlaser could be switched to a shorter wavelength by acetic acid vapor treatment or a longer wavelength by NH3 vapor treatment. This work will provide useful enlightenment for the rational design of effective switchable lasers using AIE materials with simple preparation procedures.
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- 2021
43. Large-area periodic lead halide perovskite nanostructures for lenticular printing laser displays
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Hong Wang, Ji Tang, Min Wang, Chuang Zhang, Baipeng Yin, Chenghu Dai, Yuchen Wu, Yong Sheng Zhao, Haohao Li, and Jingwen Li
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Brightness ,Materials science ,business.industry ,High-refractive-index polymer ,Lenticular printing ,Stereoscopy ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,0104 chemical sciences ,law.invention ,law ,Optoelectronics ,Light emission ,0210 nano-technology ,business ,Image resolution ,Perovskite (structure) - Abstract
Lenticular printing technique provides a promising way to realize stereoscopic displays, especially, when microscopic optical structures are integrated into light-emitting materials/devices. Here, we fabricated large-area periodic structures with a spatial resolution at a wavelength scale from hybrid perovskite materials via a space-confined solution growth method. It takes advantages of both high refractive index contrast and high luminescence brightness, which allows the optical modulation on not only the reflection of illumination, but also the light emission from hybrid perovskites. The distributed feedback within these periodic structures significantly improves the degree of polarization and directionality of laser actions while their threshold is also reduced. These findings enable us to present a prototype of lenticular printing laser displays that vary emission colors at different view angles, which may find applications in creating high-resolution and high-contrast holographical images.
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- 2020
44. Experimentally Observed Reverse Intersystem Crossing‐Boosted Lasing
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Chan Qiao, Zhiyou Wei, Chuang Zhang, Kang Wang, Jie Liang, Qian Peng, Lu Wang, Yong Sheng Zhao, Zhigang Shuai, Haiyun Dong, Yongli Yan, and Zhonghao Zhou
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education.field_of_study ,Organic laser ,Materials science ,010405 organic chemistry ,Population ,Physics::Optics ,General Chemistry ,General Medicine ,010402 general chemistry ,Laser ,Population inversion ,01 natural sciences ,Molecular physics ,Catalysis ,0104 chemical sciences ,law.invention ,Intersystem crossing ,law ,Radiative transfer ,Stimulated emission ,education ,Lasing threshold - Abstract
Thermally activated delayed-fluorescent (TADF) materials are anticipated to overcome triplet-related losses towards electrically driven organic lasers. Thus far, contributions from triplets to lasing have not yet been experimentally demonstrated owing to the limited knowledge about the excited-state processes. Herein, we experimentally achieve reverse intersystem crossing (RISC)-boosted lasing in organic microspheres with uniformly dispersed TADF emitters. In these materials, triplets are continuously converted to radiative singlets through RISC, giving rise to reduced losses in stimulated emission. The involvement of regenerated singlets in population inversion results in a thermally activated lasing; that is, the lasing intensity increases with increasing temperature, accompanied by accelerated depletion of the excited-state population. Benefiting from the suppression of triplet accumulations by RISC processes, a high-repetition-rate microlaser was achieved.
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- 2020
45. Spatially Responsive Multicolor Lanthanide‐MOF Heterostructures for Covert Photonic Barcodes
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Fengqin Hu, Zifei Wang, Xiangeng Meng, Yong Sheng Zhao, Tongjin Zhang, Xue Wang, Zhenhua Gao, Yang Liu, Xun Sun, Zhen Liu, Weiguang Zhang, Yongli Yan, and Baoyuan Xu
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Materials science ,010405 organic chemistry ,business.industry ,Energy transfer ,Spatially resolved ,Heterojunction ,Nanotechnology ,General Chemistry ,General Medicine ,010402 general chemistry ,01 natural sciences ,Catalysis ,0104 chemical sciences ,Covert ,Photonics ,business - Abstract
Micro/nanoscale photonic barcodes based on multicolor luminescent segmented heterojunctions hold potential for applications in information security. However, such multicolor heterojunctions reported thus far are exclusively based on static luminescent signals, thus restricting their application in advanced confidential information protection. Reported here is a strategy to design responsive photonic barcodes with heterobimetallic (Tb3+ /Eu3+ ) metal-organic framework multicolor heterostructures. The spatial colors could be precisely controlled by thermally manipulating the energy-transfer process between the two lanthanides, thus achieving responsive covert photonic barcodes. Also demonstrated is that spatially resolved responsive barcodes with multi-responsive features could be created in a single heterostructure. These findings offer unique opportunities to purposely design highly integrated responsive microstructures and smart devices toward advanced anti-counterfeiting applications.
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- 2020
46. Tuneable red, green, and blue single-mode lasing in heterogeneously coupled organic spherical microcavities
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Kang Wang, Chunhuan Zhang, Yong Sheng Zhao, Chan Qiao, Chang-Ling Zou, Yuxiang Du, and Jiannian Yao
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lcsh:Applied optics. Photonics ,Materials science ,Physics::Optics ,02 engineering and technology ,Micro-optics ,01 natural sciences ,Article ,law.invention ,010309 optics ,Resonator ,law ,0103 physical sciences ,lcsh:QC350-467 ,Multi-mode optical fiber ,business.industry ,Single-mode optical fiber ,lcsh:TA1501-1820 ,021001 nanoscience & nanotechnology ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Microresonators ,Modulation ,Optoelectronics ,Photonics ,0210 nano-technology ,business ,Lasing threshold ,lcsh:Optics. Light ,Visible spectrum - Abstract
Tuneable microlasers that span the full visible spectrum, particularly red, green, and blue (RGB) colors, are of crucial importance for various optical devices. However, RGB microlasers usually operate in multimode because the mode selection strategy cannot be applied to the entire visible spectrum simultaneously, which has severely restricted their applications in on-chip optical processing and communication. Here, an approach for the generation of tuneable multicolor single-mode lasers in heterogeneously coupled microresonators composed of distinct spherical microcavities is proposed. With each microcavity serving as both a whispering-gallery-mode (WGM) resonator and a modulator for the other microcavities, a single-mode laser has been achieved. The colors of the single-mode lasers can be freely designed by changing the optical gain in coupled cavities owing to the flexibility of the organic materials. Benefiting from the excellent compatibility, distinct color-emissive microspheres can be integrated to form a heterogeneously coupled system, where tuneable RGB single-mode lasing is realized owing to the capability for optical coupling between multiple resonators. Our findings provide a comprehensive understanding of the lasing modulation that might lead to innovation in structure designs for photonic integration., Lasers: Generating all colors in a better mode A system for improved control over laser light emission generates any frequency in the visible spectrum, creating what is termed a red, green and blue (RGB) laser, in the advantageous form known as ‘single-mode’ lasing. Most RGB lasers deliver ‘multimode’ signals, in which the light is distributed among several wavelengths around the central most intense and desired wavelength. The preferable single-mode RGB lasing has been developed by researchers in China, led by Yong Sheng Zhao at the Institute of Chemistry of the Chinese Academy of Sciences in Beijing. It uses closely coupled organic (carbon compound-based) microcavities as the regions in which the light is generated and amplified, delivering single frequencies of tunable laser light. This innovation will open new possibilities for using RGB lasing in optical processing and communications systems.
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- 2020
47. Organoplatinum(II) Cruciform: A Versatile Building Block to Fabricate 2D Microcrystals with Full‐Color and White Phosphorescence and Anisotropic Photon Transport
- Author
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Fa‐Feng Xu, Wei Zeng, Meng‐Jia Sun, Zhong‐Liang Gong, Zhong‐Qiu Li, Yong Sheng Zhao, Jiannian Yao, and Yu‐Wu Zhong
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General Medicine ,General Chemistry ,Catalysis - Abstract
Conventional square-planar platinum complexes typically form one-dimensional assemblies as a result of unidirectional metallophilic and/or π⋅⋅⋅π intermolecular interactions. Organoplatinum(II) complexes with a cruciform shape are presented herein to construct two-dimensional (2D) microcrystals with full-color and white phosphorescence. These 2D crystals show unique monocomponent π⋅⋅⋅π stacking, from either the cyclometalating or noncyclometalating ligand, and the bicomponent alternate π⋅⋅⋅π stacking from both ligands along different facet directions. Anisotropic tri-directional waveguiding is further implemented on a single hexagonal microcrystal. These results demonstrate the great capability of the organoplatinum(II) cruciform as a general platform to fabricate 2D phosphorescent micro-/nanocrystals for advanced photonic applications.
- Published
- 2022
48. Recent advances in luminescent metal-organic frameworks and their photonic applications
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Zhonghao Zhou, Yong Sheng Zhao, Yongli Yan, and Penghao Li
- Subjects
Materials science ,business.industry ,Metals and Alloys ,Nanophotonics ,Nanotechnology ,General Chemistry ,Electroluminescence ,Catalysis ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Homogeneous ,Optoelectronic materials ,Materials Chemistry ,Ceramics and Composites ,Metal-organic framework ,Photonics ,Luminescence ,business - Abstract
In recent years, metal-organic frameworks (MOFs) have been attracting ever more interest owing to their fascinating structures and widespread applications. Among the optoelectronic materials, luminescent MOFs (LMOFs) have become one of the most attractive candidates in the fields of optics and photonics thanks to the unique characteristics of their frameworks. Luminescence from MOFs can originate from either the frameworks, mainly including organic linkers and metal ions, or the encapsulated guests, such as dyes, perovskites, and carbon dots. Here, we systematically review the recent progress in LMOFs, with an emphasis on the relationships between their structures and emission behaviour. On this basis, we comprehensively discuss the research progress and applications of multicolour emission from homogeneous and heterogeneous structures, host-guest hybrid lasers, and pure MOF lasers based on optically excited LMOFs in the field of micro/nanophotonics. We also highlight recent developments in other types of luminescence, such as electroluminescence and chemiluminescence, from LMOFs. Future perspectives and challenges for LMOFs are provided to give an outlook of this emerging field. We anticipate that this article will promote the development of MOF-based functional materials with desired performance towards robust optoelectronic applications.
- Published
- 2021
49. 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
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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
50. Chiral Hybrid Perovskite Single‐Crystal Nanowire Arrays for High‐Performance Circularly Polarized Light Detection
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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
- Subjects
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
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