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American Physical Society, Physical Review Letters, 23(95), 2005

DOI: 10.1103/physrevlett.95.236804

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

Journal article published in 2005 by A. F. van Driel, G. Allan, C. Delerue ORCID, P. Lodahl, W. L. Vos ORCID, D. Vanmaekelbergh
This paper is available in a repository.
This paper is available in a repository.

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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 supra-linear 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 supra-linear dependence is in agreement with the results of tight-binding calculations. ; Comment: 11 pages