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Phys Rev Lett. 2003 Jun 27;90(25 Pt 1):257404. Epub 2003 Jun 26.

Temperature dependence of the luminescence lifetime of single CdSe/ZnS quantum dots.

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Centre de Physique Moléculaire Optique et Hertzienne, CNRS, 351 Cours de la Libération, 33405 Talence Cedex, France.


We study the temperature dependence of the luminescence decay of single CdSe/ZnS quantum dots between 2 and 140 K. For the first time, we observe a biexponential decay which was completely hidden in ensemble measurements. We find that the long time component strongly depends on temperature. This demonstrates that the band edge luminescence arises from two thermally mixed fine structure states, the dark ground state and the lowest bright one. To interpret our results, we derive the analytical expressions for the decay using a three level model. Fitting the experimental data leads directly to the lifetime of the states as well as their energy splitting.

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