Temperature Dependence of Single CdSe/ZnS Quantum Dots Luminescence Lifetime

LABEAU, Olivier; TAMARAT, Philippe; LOUNIS, Brahim

doi:10.1103/PhysRevLett.90.257404

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LABEAU, Olivier
Centre de physique moléculaire optique et hertzienne [CPMOH]

TAMARAT, Philippe
Centre de physique moléculaire optique et hertzienne [CPMOH]

LOUNIS, Brahim
Centre de physique moléculaire optique et hertzienne [CPMOH]

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Ce document a été publié dans

Physical Review Letters. 2003-06-26, vol. 90, p. 257404

American Physical Society

Résumé en anglais

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.< Réduire

Mots clés

single molecule detection

CdSe quantum dots

luminescence decay

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