Frequency-Dependent Spontaneous Emission Rate from CdSe and CdTe Nanocrystals: Influence of Dark States

A.F. van Driel; G. Allan; C. Delerue; P. Lodahl; Willem L. Vos; D. Vanmaekelbergh

doi:10.1103/PhysRevLett.95.236804

Frequency-Dependent Spontaneous Emission Rate from CdSe and CdTe Nanocrystals: Influence of Dark States

A.F. van Driel, G. Allan, C. Delerue, P. Lodahl, Willem 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 language	Undefined
Pages (from-to)	1-4
Number of pages	4
Journal	Physical review letters
Volume	95
Issue number	236804
DOIs	https://doi.org/10.1103/PhysRevLett.95.236804
Publication status	Published - 2005

Keywords

METIS-225662
IR-53203

Access to Document

10.1103/PhysRevLett.95.236804

frequency

Cite this

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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.",

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AU - Vos, Willem L.

AU - Vanmaekelbergh, D.

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N2 - 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.

AB - 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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KW - IR-53203

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DO - 10.1103/PhysRevLett.95.236804

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