Preparation of CdSe/ZnSe Core-shell Nanocrystal in One-step Reaction

Abstract

Abstract: High-quality Zn-doped CdSe core-shell nanocrystals were successfully prepared by incorporating a stoichiometric amount of Zn precursor into the CdSe reaction system, in which the Se precursor was excess and an Se-rich surface was formed.By injecting different amounts of Zn precursor, the core-shell nanocrystals demonstrated by the emission spectra were formed.The obtained Zn-doped CdSe nanocrystals exhibit a photoluminescence efficiency from 30% to 85%, which is comparable to those for the reported CdSe/ZnS, CdSe/CdS in the literature.In particular, a shell ZnSe layer with different thicknesses of ZnSe can be formed in this experiment by only changing the amount of Zn precursor added, which is simple and effective.

Key words: CdSe/ZnSe, Core-shell, one-step, Photoluminescence

FEI Xiao-fang, SHAN Gui-ye, KONG Xiang-gui, WANG Xin, ZENG Qing-hui, ZHANG You-lin. Preparation of CdSe/ZnSe Core-shell Nanocrystal in One-step Reaction[J]. Chemical Research in Chinese Universities, 2005, 21(6): 728-733.

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