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

A. F. van Driel, G. Allan, C. Delerue, Peter Lodahl, W. L. Vos, D. Vanmaekelbergh

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Abstract

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.
Original languageEnglish
JournalPhysical Review Letters
Volume95
Issue number23
Pages (from-to)236804
ISSN0031-9007
DOIs
Publication statusPublished - 2005

Bibliographical note

Copyright 2005 American Physical Society

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