10.1021/acsnano.5b07328.s001 Gabriele Rainò Gabriele Rainò Georgian Nedelcu Georgian Nedelcu Loredana Protesescu Loredana Protesescu Maryna I. Bodnarchuk Maryna I. Bodnarchuk Maksym V. Kovalenko Maksym V. Kovalenko Rainer F. Mahrt Rainer F. Mahrt Thilo Stöferle Thilo Stöferle Single Cesium Lead Halide Perovskite Nanocrystals at Low Temperature: Fast Single-Photon Emission, Reduced Blinking, and Exciton Fine Structure American Chemical Society 2016 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 2016-01-15 00:00:00 Journal contribution 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.