Size influence on the fluorescence decay time of ZnS:Mn2+ nanocrystals |
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Authors: | Song Jing Zhang Gao-feng Xing Tong-yan Xu Jian-ping Zhang Xiao-song and Huang Qing-song |
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Affiliation: | 1. Tianjin Zhonghuan Neolight Technology Co., Ltd, Tianjin, 300385, China 2. Key Laboratory of Display Materials and Photoelectric Devices, Ministry of Education, Institute of Material Physics, Tianjin University of Technology, Tianjin, 300384, China 3. Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China
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Abstract: | ZnS:Mn2+ nanocrystals (NCs) with particle size from 1.9 nm to 3.2 nm are synthesized via chemical precipitation method with different
S2−]/Zn2+] ratios. The size dependent decay for Mn emission exhibits a double exponential behavior. And two lifetime values, in millisecond
time domain, can both be shortened with size increasing, which is attributed to enhanced interaction between host and Mn2+ impurity. A molecular structure model is proposed to interpret the tendency of two lifetime components, which is correlated
to the number of S vacancy (Vs) defects around Mn2+. |
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Keywords: | |
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