Highlights

• The paper introduces melt crystallization in halide salts as a solvent-free route for preparing lead halide perovskite nanocrystals.
• Using SrBr₂ as a growth medium, the team produced CsPbBr₃ nanocrystals with 524 nm emission and a narrow 25 nm linewidth.
• The approach can be extended to other alkali and alkaline-earth halides, suggesting a general solid-state synthesis route.

Summary

This work marks a turning point from solution-based colloidal synthesis toward solid-state preparation of perovskite nanocrystals. Conventional perovskite nanocrystal synthesis often uses organic solvents and ligands, creating cost, safety, and waste concerns. By using molten halide salts as a growth medium, Professor Li’s team showed that high-quality CsPbBr₃ nanocrystals can be formed through melt crystallization. The material retained narrow green emission suitable for wide-color-gamut displays. The novelty lies in using an inorganic molten environment as both a reaction medium and a stabilizing context, opening a path toward more scalable and environmentally practical perovskite nanocrystal production.

Citation: B. Wang et al., “Synthesis of lead halide perovskite nanocrystals by melt crystallization in halide salts,” Chemical Communications, vol. 56, pp. 11291–11294, 2020, doi: 10.1039/D0CC04020G.