Controllable emission bands and morphologies of high-quality CsPbX3 perovskite nanocrystals prepared in octane

Halide perovskite (CsPbX 3 , X = Cl, Br, or I) quantum dots have received increasing attention as novel colloidal nanocrystals (NCs). Accurate control of emission bands and NC morphologies are vital prerequisites for most CsPbX 3 NC practical applications. Therefore, a facile method of synthesizing CsPbX 3 (X = Cl, Br, or I) NCs in the nonpolar solvent octane was developed. The process was conducted in air at ∼ 90 °C to synthesize high-quality CsPbX 3 NCs showing 12–44 nm wide emission and high photoluminescence quantum yield, exceeding 90%. An in situ anion-exchange method was developed to tune CsPbX 3 NC photoluminescence emission, using PbX 2 dissolved in octane as the halide source. NC morphology was controlled by dissolving specific metal–organic salts in the precursor solution prior to nucleation, and nanocubes, nanodots, nanosheets, nanoplatelets, nanorods, and nanowires were obtained following the same general method providing a facile, versatile route to controlling CsPbX 3 NC emission bands and morphologies, which will broaden the range of CsPbX 3 NC practical applications.