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|Title:||Composition-tunable ZnxCd1-xSe nanocrystals with high luminescence and stability|
|Authors:||Zhong, X. |
|Citation:||Zhong, X., Han, M., Dong, Z., White, T.J., Knoll, W. (2003-07-16). Composition-tunable ZnxCd1-xSe nanocrystals with high luminescence and stability. Journal of the American Chemical Society 125 (28) : 8589-8594. ScholarBank@NUS Repository. https://doi.org/10.1021/ja035096m|
|Abstract:||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.|
|Source Title:||Journal of the American Chemical Society|
|Appears in Collections:||Staff Publications|
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