The power conversion efficiency of photovoltaic devices based onsemiconductor perovskites has reached ~20% after just several years of researchefforts. With concomitant discoveries of other promising applications inlasers, light-emitting diodes and photodetectors, it is natural to anticipatewhat further excitements these exotic perovskites could bring about. Here wereport on the observation of single photon emission from single CsPbBr3perovskite nanocrystals (NCs) synthesized from a facile colloidal approach.Compared with traditional metal-chalcogenide NCs, these CsPbBr3 NCs exhibitnearly two orders of magnitude increase in their absorption cross sections atsimilar emission colors. Moreover, the radiative lifetime of CsPbBr3 NCs isgreatly shortened at both room and cryogenic temperatures to favor an extremelyfast output of single photons. The above findings have not only added a novelmember to the perovskite family for the integration into current optoelectronicarchitectures, but also paved the way towards quantum-light applications ofsingle perovskite NCs in various quantum information processing schemes.
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