Single Cesium Lead Halide Perovskite Nanocrystals at Low Temperature: Fast Single-Photon Emission, Reduced Blinking, and Exciton Fine Structure Gabriele Rainò Georgian Nedelcu Loredana Protesescu Maryna I. Bodnarchuk Maksym V. Kovalenko Rainer F. Mahrt Thilo Stöferle 10.1021/acsnano.5b07328.s001 https://acs.figshare.com/articles/journal_contribution/Single_Cesium_Lead_Halide_Perovskite_Nanocrystals_at_Low_Temperature_Fast_Single_Photon_Emission_Reduced_Blinking_and_Exciton_Fine_Structure/2067597 Metal-halide semiconductors with perovskite crystal structure are attractive due to their facile solution processability, and have recently been harnessed very successfully for high-efficiency photovoltaics and bright light sources. Here, we show that at low temperature single colloidal cesium lead halide (CsPbX<sub>3</sub>, where X = Cl/Br) nanocrystals exhibit stable, narrow-band emission with suppressed blinking and small spectral diffusion. Photon antibunching demonstrates unambiguously nonclassical single-photon emission with radiative decay on the order of 250 ps, representing a significant acceleration compared to other common quantum emitters. High-resolution spectroscopy provides insight into the complex nature of the emission process such as the fine structure and charged exciton dynamics. 2016-01-15 00:00:00 radiative decay exciton dynamics Halide Perovskite Nanocrystals 250 ps light sources Reduced Blinking perovskite crystal structure emission process Single Cesium solution processability Low Temperature quantum emitters Photon antibunching