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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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 languageUndefined
Pages (from-to)1-4
Number of pages4
JournalPhysical review letters
Issue number236804
Publication statusPublished - 2005


  • METIS-225662
  • IR-53203

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