Exciton radiative recombination in spherical CdS/CdSe/CdS quantum-well nanostructures

被引：19

作者：

Xu, JF ^{[1
]}

Xiao, M

Battaglia, D

Peng, XG

机构：

[1] Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA

[2] Univ Arkansas, Dept Chem & Biochem, Fayetteville, AR 72701 USA

来源：

APPLIED PHYSICS LETTERS | 2005年 / 87卷 / 04期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.2001731

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Photoluminescence (PL) and lifetimes of colloidal CdS/CdSe/CdS (core/well/shell) quantum-well (QW) nanostructures are investigated for different well thicknesses in the temperature range of 77-300 K. When the temperature increases, the PL intensity decreases continuously and PL peak shifts to lower energy side. The PL lifetimes for the 1-3 monolayer (ML) CdSe QWs increase with temperature and radiative recombination dominates the decay processes. The radiative lifetimes basically increase linearly with temperature, which indicates the existence of free two-dimensional excitons. For the 4 ML CdSe QW sample, the lifetime does not increase with temperature, showing more nonradiative processes due to more defect formation within the thicker QWs. (c) 2005 American Institute of Physics.

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