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Pré-Publication, Document De Travail Année : 2004

Measurement of the radiative and non-radiative decay rates of single CdSe nanocrystals through controlled modification of their spontaneous emission

Laurent Coolen
Maxime Dahan
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Résumé

We present a simple method to measure the radiative and non-radiative recombination rates of individual fluorescent emitters at room temperature. By placing a single molecule successively close and far from a dielectric interface and simultaneously measuring its photoluminescence decay and its orientation, both the radiative and non-radiative recombination rates can be determined. For CdSe nanocrystals, our results demonstrate that the fluorescence quantum efficiency, determined at the single molecule level, is 98% in average, far above the value expected from conventional ensemble experiments. The bi-dimensionnal nature of the transition dipole is also directly evidenced from a single particle measurement.
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Dates et versions

hal-00002445 , version 1 (04-08-2004)

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X. Brokmann, Laurent Coolen, Maxime Dahan, J.P. Hermier. Measurement of the radiative and non-radiative decay rates of single CdSe nanocrystals through controlled modification of their spontaneous emission. 2004. ⟨hal-00002445⟩
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