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

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

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Title: Composition-tunable ZnxCd1-xSe nanocrystals with high luminescence and stability
Author: Zhong, Xinhua; Han, Ming-Yong; Dong, Zhili; White, Timothy John; Knoll, Wolfgang
Copyright year: 2003
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.
Subject: DRNTU::Engineering::Materials::Nanostructured materials.
Type: Journal Article
Series/ Journal Title: Journal of the American chemical society
School: School of Materials Science and Engineering
Rights: © 2003 American Chemical Society.

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