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

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

2005-09-22

arxiv.org/abs/cond-mat/0509565v2

Phys. Rev. Lett. 95, 236804 (2005)

Physics

Condensed Matter

Materials Science

11 pages

Scientific paper

10.1103/PhysRevLett.95.236804

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 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.

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