Quantum efficiency of stimulated emission in colloidal semiconductor nanocrystal quantum dots

被引：10
|
作者：
Zhang, Chunfeng [1 ]
Xu, Jian [1 ]
Zhu, Ting [1 ]
Zhang, Fan [1 ]
Tan, Zhanao [1 ]
Schiff, Steven J. [1 ]
Su, Huaipeng [2 ]
Gao, Shuai [2 ]
Wang, Andrew Y. [3 ]
机构：
[1] Penn State Univ, Dept Engn Sci & Mech, University Pk, PA 16802 USA
[2] Tianjin Univ, Dept Chem Engn, Tianjin 300072, Peoples R China
[3] Ocean NanoTech LLC, Fayetteville, AR 72701 USA
来源：
PHYSICAL REVIEW B | 2009年 / 80卷 / 03期
基金：
美国国家科学基金会;
关键词：
AMPLIFIED SPONTANEOUS EMISSION; LIGHT-EMITTING-DIODES; RAT C6 GLIOMA; OPTICAL GAIN; ROOM-TEMPERATURE; NANOSENSORS; COMPOSITE; CELLS;
D O I：
10.1103/PhysRevB.80.035333
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
External differential quantum efficiencies were studied for the stimulated emission of thin films of colloidal CdSe/CdS/ZnS nanocrystal quantum dots (NQDs) using the integrating sphere technique. A maximum efficiency of 34% was measured for the stimulated emission in NQDs which far exceeds that for spontaneous emission (9%). The competition between the radiative exciton/biexciton recombination and the carrier density-dependent nonradiative relaxation processes in NQDs was modeled to account for the observed difference in efficiency.
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页数：6
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