Photostability of colloidal single photon emitter in near-infrared regime at room temperature

Abstract

Abstract In this study, the photostability of a colloidal single photon emitter in near-infrared regime at room temperature was investigated. The fluorescence lifetime, blinking phenomenon and anti-bunching effect of a single CdTeSe/ZnS quantum dot with emission wavelength of 800 nm at room temperature were studied. The second-order correlation function at zero delay time was much smaller than 0.1, which proved that the emission from single quantum dots at 800 nm is a highly pure single-photon source. The effects of the irradiation duration on the fluorescence from single quantum dots were analysed. A recombination model including multi-nonradiative recombination center model and multi-charged model was used to explain the results.