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We present a simple method to measure the radiative and non-radiativerecombination rates of individual fluorescent emitters at room temperature. Byplacing a single molecule successively close and far from a dielectricinterface and simultaneously measuring its photoluminescence decay and itsorientation, both the radiative and non-radiative recombination rates can bedetermined. For CdSe nanocrystals, our results demonstrate that thefluorescence quantum efficiency, determined at the single molecule level, is98% in average, far above the value expected from conventional ensembleexperiments. The bi-dimensionnal nature of the transition dipole is alsodirectly evidenced from a single particle measurement.Comment: to appear in PR

Measurement of the Radiative and Nonradiative Decay Rates of Single CdSe Nanocrystals through a Controlled Modification of their Spontaneous Emission