Composition-tunable ZnxCd1-xSe nanocrystals with high luminescence and stability

被引:538
作者
Zhong, XH
Han, MY [1 ]
Dong, ZL
White, TJ
Knoll, W
机构
[1] Natl Univ Singapore, Dept Mat Sci, Singapore 117543, Singapore
[2] Natl Univ Singapore, Dept Chem, Singapore 117543, Singapore
[3] Inst Mat Res & Engn, Singapore 117602, Singapore
[4] Inst Environm Sci & Engn, Singapore 637723, Singapore
关键词
D O I
10.1021/ja035096m
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
High-quality ZnxCd1-xSe nanocrystals have been successfully prepared at high temperature by incorporating stoichiometric amounts of Zn and Se into pre-prepared CdSe nanocrystals. With increasing Zn content, a composition-tunable emission across most of the visible spectrum has been demonstrated by a systematic blue-shift in emission wavelength. The photoluminescence (PL) properties for the obtained ZnxCd1-xSe nanocrystals (PL efficiency of 70-85%, fwhm = 22-30 nm) are comparable to those for the best reported CdSe-based QDs. In particular, they also have good PL properties in the blue spectral range. Moreover, the alloy nanocrystals can retain their high luminescence (PL efficiency of over 40%) when dispersed in aqueous solutions and maintain a symmetric peak shape and spectral position under rigorous experimental conditions. A rapid alloying process was observed at a temperature higher than "alloying point". The mechanism of the high luminescence efficiency and stability of ZnxCd1-xSe nanocrystals is explored.
引用
收藏
页码:8589 / 8594
页数:6
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