中国物理B ›› 2005, Vol. 14 ›› Issue (11): 2262-2268.doi: 10.1088/1009-1963/14/11/021

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Formation and spectroscopic characterization of mono-dispersed CdSe nanocrystals

苗雁鸣, 李超荣, 曹立, 刘瑞斌, 何玉平, 解思深, 邹炳锁   

  1. Nanoscale Physics and Device Laboratory, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2005-03-24 修回日期:2005-05-30 出版日期:2005-11-20 发布日期:2005-11-20

Formation and spectroscopic characterization of mono-dispersed CdSe nanocrystals

Miao Yan-Ming (苗雁鸣), Li Chao-Rong (李超荣), Cao Li (曹立), Liu Rui-Bin (刘瑞斌), He Yu-Ping (何玉平), Xie Si-Shen (解思深), Zou Bing-Suo (邹炳锁)   

  1. Nanoscale Physics and Device Laboratory, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2005-03-24 Revised:2005-05-30 Online:2005-11-20 Published:2005-11-20

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摘要： In this article, mono-dispersed hexagonal structure CdSe nanocrystals with polyhedron shape were prepared by an open solvent thermal reaction. They show a discrete excitonic transition structure in the absorption spectra and the minimal photoluminescence (PL) peak full-width at half-maximum of 19\,nm. The PL quantum yield is about 60%. Transmission electron micrographs,high-resolution transmission electron micrographs, x-ray powder diffraction patterns, UV-vis absorption spectra and PL spectra were obtained for the as-prepared CdSe nanocrystals. The size of the CdSe nanocrystals can be tuned by changing the reaction temperature or time. Due to the improved synthesis method, a different growth mechanism of the CdSe nanocrystals is discussed.

关键词: mono-dispersed, nanocrystals, formation

Abstract: In this article, mono-dispersed hexagonal structure CdSe nanocrystals with polyhedron shape were prepared by an open solvent thermal reaction. They show a discrete excitonic transition structure in the absorption spectra and the minimal photoluminescence (PL) peak full-width at half-maximum of 19 nm. The PL quantum yield is about 60%. Transmission electron micrographs,high-resolution transmission electron micrographs, x-ray powder diffraction patterns, UV-vis absorption spectra and PL spectra were obtained for the as-prepared CdSe nanocrystals. The size of the CdSe nanocrystals can be tuned by changing the reaction temperature or time. Due to the improved synthesis method, a different growth mechanism of the CdSe nanocrystals is discussed.

Key words: mono-dispersed, nanocrystals, formation

中图分类号:  (Nanocrystals, nanoparticles, and nanoclusters)

  • 78.67.Bf
78.55.Et (II-VI semiconductors) 78.40.Fy (Semiconductors) 61.46.Hk (Nanocrystals)