Effects of the dark-exciton state on photoluminescence dynamics in surface-modified US quantum dots prepared by a colloidal method

被引：17

作者：

Kim, D ^{[1
]}

Mishima, T ^{[1
]}

Nakayama, M ^{[1
]}

机构：

[1] Osaka City Univ, Grad Sch Engn, Dept Appl Phys, Sumiyoshi Ku, Osaka 5588585, Japan

来源：

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2004年 / 21卷 / 2-4期

关键词：

dark exciton; CdS; quantum dot; colloidal method;

D O I：

10.1016/j.physe.2003.11.037

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We have investigated exciton dynamics in surface-modified CdS quantum dots (QDs) prepared by a colloidal method. The size- and surface-controlled US QDs have been successfully prepared by using a size-selective photoetching and surface modification technique. The decay profiles exhibit an unusual temperature dependence: increase of the decay time with increase in temperature. The temperature dependence of the decay profiles can be explained in terms of a three-level model including the exciton state with a triplet origin, the so-called dark-exciton state. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：363 / 366

页数：4

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