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

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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.
to appear in PRL

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http://salesiana.dossiersoluciones.com/handle/123456789/223189

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0408087
 http://arxiv.org/abs/cond-mat/0408087
 Phys. Rev. Lett. 93, 107403 (2004)
 doi:10.1103/PhysRevLett.93.107403

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arXiv