Observation of excitonic states in PbSe nanocrystals

被引：24

作者：

Guha, S ^{[1
]}

Leppert, VJ

Risbud, SH

Kang, I

机构：

[1] USN, Res Lab, Div Condensed Matter & Radiat Sci, Washington, DC 20375 USA

[2] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA

[3] Cornell Univ, Dept Appl Phys, Ithaca, NY 14853 USA

来源：

SOLID STATE COMMUNICATIONS | 1998年 / 105卷 / 11期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0038-1098(97)10217-4

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report the observation of excitonic states in PbSe nanocrystals with a size distribution varying between 2 and 6 nm. Size selective photoluminescence (PL) and PL excitation spectroscopy (PLE) are used to probe the discrete excitonic states associated with PbSe nanocrystals. By using various excitation wavelengths, we observed two broad PL bands between 300 and 900 nm. These PL bands were identified as the first-and second-exciton recombination in PbSe nanocrystals. A reasonable agreement is obtained between the observed strong bands and calculated oscillator strengths for exciton recombination in PbSe nanocrystals with an average particle size of 4 (+/-2) nm. (C) 1998 Elsevier Science Ltd.

引用

页码：695 / 699

页数：5

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