Photon statistics of a single photon source

We report on the realization of a single photon source relying on the pulsed excitation of a single organic molecule at room temperature, and the study of its intensity fluctuations over 4 orders of magnitude of the observation time scale. On time scale of a few. excitation periods, sub-poissonian statistics is clearly observed and the probability of multiphoton events is 10 times smaller than for equivalent Poissonian pulses. An excess of noise appears on longer timescale, due to the blinking produced by, the molecular triplet state.