Papers by Author: Xuan Lin Chen

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Authors: Li Min An, Xuan Lin Chen, Xue Ting Han, Jie Yi, Chun Xia Liu, Wen Yu An, Yu Qiu Qu, Jian Guang Chi, Hong Wei, Kai Yue Qi, Ya Nan Wen, Qiang Wang, Wei Gang Zhou, Hong An Ye, Zhuo Sun
Abstract: CdSe/ZnO core/shell semiconductor nanocrystals which show high luminescence quantum yield have been synthesized through a simple routine without the use of any pyrophoric organometallic precursors. Transmission electron microscope image demonstrates the shape, monodispersity, average size, size distribution and core-shell structure of CdSe/ZnO nanocrystals. We use a combination of X-ray diffraction, UV-Vis absorption spectroscopy and photoluminescence to analyze the core/shell nanocrystals and determine their chemical composition, optical character and internal structure.
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Authors: Xuan Lin Chen, Yu Qiu Qu, Gui Fan Li, Hong Wei, Liu Yang Zhang, Li Min An
Abstract: The CdSe/ZnS core/shell quantum dots (QDs) were synthesized and characterized with absorption spectrometry, photoluminescence (PL) spectrometry and transmission electron microscopy. PL quenching of colloidal CdSe/ZnS QDs in the presence of charge transferring material was studied by means of steady-state and time-resolved PL spectroscopy. With increasing charge transferring materials concentration in the CdSe/ZnS QDs solution, the PL intensity and lifetime of CdSe/ZnS QDs decrease gradually. The quenching efficiency of CdSe/ZnS QDs decrease with increasing the oxidation potential of charge transferring materials. Based on the analysis, there are two pathways in the PL quenching process: static quenching and dynamic quenching. The dynamic quenching is correlated with hole transfer from QDs to the charge transferring materials.
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Authors: Li Min An, Xue Ting Han, Xuan Lin Chen, Shao Hong Gao, Xi Ping Cai, Xu Fu, He Zhu, Jian Nan Liu, Xiang Chun Xi, Pu Nan Sun, Hong An Ye, Zhuo Sun
Abstract: We have developed a new, simple, green and very reproducible aqueous synthesis method for the preparation of different sizes CdTe QDs without the use of any pyrophoric organometallic precursors. Transmission electron microscope image demonstrates the shape, monodispersity, average size and size distribution. Two different sizes CdTe QDs are mixed and standing for three months in aqueous solution. Through UV-Vis absorption spectroscopy and fluorescence spectrum detection, we confirm Ostwald ripening process can also occur in CdTe QDs mixed solution for a long time at room temperature.
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