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Phys Rev Lett. 2005 Dec 2;95(23):236804. Epub 2005 Dec 1.

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

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  • 1Debye Institute, Utrecht University, P.O. Box 80 000, 3508 TA Utrecht, The Netherlands. a.f.vandriel@phys.uu.nl


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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