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382 results on '"Tu, Datao"'

106. Polarized upconversion luminescence from a single LiLuF4:Yb3+Er3+microcrystal for orientation tracking

Author

Wei, Shouquan, Shang, Xiaoying, Huang, Ping, Zheng, Wei, Ma, En, Xu, Jin, Zhang, Meiran, Tu, Datao, and Chen, Xueyuan

Abstract

Polarized upconversion luminescence (UCL) of lanthanide-doped micro/nano-crystals has shown great promise in single-particle tracking and super-resolution bioimaging. However, because of the spectral line broadening and multiple sites of lanthanide in upconversion particles (UCPs), the crystal-field (CF) polarization components of UCL are usually undistinguishable. Herein, we report the linearly polarized UCL in LiLuF4:Yb3+/Er3+single microcrystals with resolvable CF transition lines and a polarization degree up to 0.82. The CF levels and CF transition lines of Er3+, as well as their emission polarization anisotropy, are unraveled for the first time through low-temperature and high-resolution photoluminescence (PL) and UCL spectroscopies. By taking advantage of the well-resolved and highly-polarized CF transition lines of Er3+, we demonstrate the application of LiLuF4:Yb3+/Er3+single microcrystals as anisotropic UCL probes for orientation tracking. These findings provide fundamental insights into the polarization anisotropy of UCL in lanthanide-doped single particles, thus laying a foundation for the future design of anisotropic luminescent probes towards versatile applications.

Published
2021
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107. Combined In SituSpectroscopies Reveal the Ligand Ordering-Modulated Photoluminescence of Upconverting Nanoparticles

Author

Xiao, Qingbo, Xi, Yonglan, Wang, Jian, Tu, Datao, You, Wenwu, Ye, Xiaomei, Liu, Hong, Chen, Xueyuan, and Lin, Hongzhen

Abstract

Clear understanding of the complicated interfacial effect of luminescent nanoparticles is of vital importance for their practical applications. Here, combined in situspectroscopies based on sum-frequency generation and photoluminescence characterization of lanthanide-doped upconversion nanoparticles are established to distinguish the interfacial quenching effects from ligands and solvents. We provide clear spectroscopic evidence to demonstrate that the ligand conformation significantly influences the extent of luminescence quenching from both the ligands and solvents. Moreover, the ligand disordering induced by an enlarged surface curvature is proved to be one of the major reasons for the notorious size-dependent luminescence quenching of the upconversion nanoparticles. Finally, a conformational entropy-driven strategy is provided to increase the luminescence intensity of the upconversion nanoparticles viacapping with mixed layers of oleic and dodecanoic acids. Our findings may open up new avenues for clarifying the complex interfacial photophysical issues regarding inorganic luminescent nanoparticles and promoting their practical applications.

Published
2020
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108. Highly efficient luminescent I-III-VI semiconductor nanoprobes based on template-synthesized CuInS2 nanocrystals.

Author

Li, Xian, Tu, Datao, Yu, Shaohua, Song, Xiaorong, Lian, Wei, Wei, Jiaojiao, Shang, Xiaoying, Li, Renfu, and Chen, Xueyuan

Abstract

CuInS2 semiconductor nanocrystals (NCs) exhibit large absorption coefficient, size-dependent photoluminescence and low toxicity, making them excellent candidates in a variety of bioapplications. However, precise control of both their composition and morphology to improve the luminescent efficiency remains a great challenge via conventional direct synthesis. Herein, we present a novel low-temperature template synthesis of highly efficient luminescent CuInS2 nanoprobes from In2S3 NCs via a facile cation exchange strategy. The proposed strategy enables synthesis of a series of CuInS2 NCs with broad size tunability from 2.2 to 29.6 nm. Through rationally manipulating the stoichiometry of Cu/In, highly efficient luminescence of CuInS2 with the maximum quantum yield of 28.6% has been achieved, which is about one order of magnitude improvement relative to that of directly synthesized NCs. By virtue of the intense emission of CuInS2 nanoprobes, we exemplify their application in sensitive homogeneous biodetection for an important biomolecule of adenosine triphosphate (ATP) with the limit of detection down to 49.3 nM. Moreover, the CulnS2 nanoprobes are explored for ATP-targeted cancer cell imaging, thus revealing their great potentials in the field of cancer diagnosis and prognosis. [ABSTRACT FROM AUTHOR]

Published
2019
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116. A New Cubic Phase for a NaYF4Host Matrix Offering High Upconversion Luminescence Efficiency

Author

Wang, Limin, primary, Li, Xiyu, additional, Li, Zhengquan, additional, Chu, Wangsheng, additional, Li, Renfu, additional, Lin, Ke, additional, Qian, Haisheng, additional, Wang, Yao, additional, Wu, Changfeng, additional, Li, Jiong, additional, Tu, Datao, additional, Zhang, Qun, additional, Song, Li, additional, Jiang, Jun, additional, Chen, Xueyuan, additional, Luo, Yi, additional, Xie, Yi, additional, and Xiong, Yujie, additional

Published
2015
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119. Ultrasensitive detection of cancer biomarker microRNA by amplification of fluorescence of lanthanide nanoprobes.

Author

Lu, Lianyu, Tu, Datao, Liu, Yan, Zhou, Shanyong, Zheng, Wei, and Chen, Xueyuan

Abstract

Sensitive detection of cancer biomarker microRNAs (miRNAs) is of vital importance for cancer diagnosis and treatment. Nonetheless, the detection sensitivity in the existing miRNA bioassays is severely limited by the structural characteristics of miRNA (including small length and high sequence homology) because most of these methods are based on target amplification. Herein, we report a novel approach to sensitive and specific detection of low-abundance miRNA via a unique strategy of nanoprobe dissolution-enhanced fluorescence amplification, in which a capture probe featuring molecular beacon structure is designed. By means of this strategy, miRNA-21 was detected in a linear range from 10 fM to 100 pM with a detection limit as low as 1.38 fM. High selectivity of the newly developed biosensor was demonstrated by the good discrimination against a target with a single-base mismatch. Furthermore, this assay was used for the detection of miRNA-21 added into fetal bovine serum samples with the recovery in the range of 90.2%-108% and coefficients of variation below 10.1%, indicating its promising applications to RNA immunoassays and early cancer diagnosis. [ABSTRACT FROM AUTHOR]

Published
2018
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137. Photon upconversion in Yb3+–Tb3+ and Yb3+–Eu3+ activated core/shell nanoparticles with dual-band excitation.

Author

Dong, Hao, Sun, Ling-Dong, Wang, Ye-Fu, Xiao, Jia-Wen, Yan, Chun-Hua, Tu, Datao, and Chen, Xueyuan

Abstract

Exploring novel lanthanide-activated upconversion nanoparticles with distinctive spectral fingerprints and emission lifetimes has long been a great concern for extended optical applications. Herein, we report the study of photon upconversion emissions in Yb3+–Tb3+ and Yb3+–Eu3+ activated nanoparticles with near-infrared excitation. In these nanoparticles, a high content of Yb3+ is required for the simultaneous excitation of two Yb3+ ions, yielding a Yb3+ dimer with a higher excited energy to upconvert photons onto Tb3+ and Eu3+. The optimum doping concentration of Yb3+ ions for Yb3+–Tb3+ and Yb3+–Eu3+ pairs was determined to be 80% and 60%, respectively, which are much higher than that of Yb3+–Er3+/Tm3+ pairs. Notably, the upconversion emission lifetime of the as-prepared nanoparticles was prolonged to 2.3 ms (Tb3+) and 4.0 ms (Eu3+), respectively. Through the epitaxial growth of a Nd3+ doped shell layer, the upconversion emissions of Tb3+ and Eu3+ were intensified 25-fold. At the same time, an extra excitation band in the shorter near-infrared region from Nd3+ at 808 nm was achieved. Moreover, the emissions of Tm3+ were employed to compensate for those of Tb3+ and Eu3+ for multicolor emissions. These results highlight the upconversion emissions of Tb3+ and Eu3+ for potential multicolor imaging and multiplexed detection applications. [ABSTRACT FROM AUTHOR]

Published
2016
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150. A facile 'ship-in-a-bottle' approach to construct nanorattles based on upconverting lanthanide-doped fluorides.

Author

Lu, Shan, Tu, Datao, Li, Xingjun, Li, Renfu, and Chen, Xueyuan

Abstract

Rattle structure is a topic of great interest in design and application of nanomaterials due to the unique core@void@shell architecture and the integration of functions. Herein, we developed a novel 'ship-in-a-bottle' method to fabricate upconverting (UC) luminescent nanorattles by incorporating lanthanide-doped fluorides into hollow mesoporous silica. The size of nanorattles and the filling amount of fluorides can be well controlled. In addition, the modification of silica shell (with phenylene and amine groups) and the variation of efficient UC fluorides (NaYF:Yb,Er, NaLuF:Yb,Er, NaGdF:Yb,Er and LiYF:Yb,Er) were readily achieved. The resulting nanorattles exhibited a high capacity and pH-dependent release of the anti-cancer drug doxorubicin (DOX). Furthermore, we employed these nanorattles in proof-of-concept UC-monitoring drug release by utilizing the energy transfer process from UC fluorides to DOX, thus revealing the great potential of the nanorattles as efficient cancer theranostic agent. [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]

Published
2016
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