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Frequency-dependent spontaneous emission rate from CdSe and CdTe nanocrystals: Influence of dark states

被引：168
作者：
van Driel, AF
Allan, G
Delerue, C
Lodahl, P
Vos, WL
Vanmaekelbergh, D
机构：
[1] Univ Utrecht, Debye Inst, NL-3508 TA Utrecht, Netherlands
[2] CNRS, Dept ISEN, IEMN, UMR 8520, F-59046 Lille, France
[3] Univ Twente, Dept Sci & Technol, Complex Photon Syst COPS, NL-7500 AE Enschede, Netherlands
[4] Univ Twente, MESA, Res Inst, NL-7500 AE Enschede, Netherlands
来源：
PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 23期
关键词：
D O I：
10.1103/PhysRevLett.95.236804
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We studied the rate of spontaneous emission from colloidal CdSe and CdTe nanocrystals at room temperature. The decay rate, obtained from luminescence decay curves, increases with the emission frequency in a supralinear way. This dependence is explained by the thermal occupation of dark exciton states at room temperature, giving rise to a strong attenuation of the rate of emission. The supralinear dependence is in agreement with the results of tight-binding calculations.
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页数：4
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