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

@article{vanDriel2005FrequencydependentSE,
  title={Frequency-dependent spontaneous emission rate from CdSe and CdTe nanocrystals: influence of dark states.},
  author={A F van Driel and G. Allan and Christophe Delerue and Peter Lodahl and Willem L. Vos and Daniel Vanmaekelbergh},
  journal={Physical review letters},
  year={2005},
  volume={95 23},
  pages={
          236804
        }
}
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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