Large-Scale Synthesis of Highly Luminescent Perovskite Nanocrystals by Template-Assisted Solid-State Reaction at 800 °C

Perovskite nanocrystals (NCs) as promising narrow green emitters are widely studied, and many colloidal synthetic methods have been developed. However, large amounts of expensive and toxic organic solvents are consumed in synthesis. Herein, a high temperature solid-state confined growth strategy was developed to prepare highly emissive CsPbBr3 NCs using the in situ formed mesoporous Al2O3 as the template. The obtained CsPbBr3-Al2O3 powders possessed high quantum yield up to 70%, narrow emission line width of 25 nm, and outstanding thermal stability even better than the KSF phosphor. In addition, 500 g CsPbBr3-Al2O3 powders in one batch have been achieved, which demonstrated the potential capability of mass production with this method. Finally, this method can be expanded to other CsPbX3 (X = Cl, I) NCs through changing the halide salts. We believe that this versatile method opens up a new avenue for the large scale synthesis of high quality perovskite NCs with low cost.