Method to synthesize metal halide perovskite particles with high luminescence and stability
View Patent ↗The invention provides a convenient solution-based synthesis for metal halide perovskite particles. This method requires only mild conditions and can be easily scaled up. A ligand of a proper molecule size and an optimized precursor ratio are important to obtain pure phase particles. As an example, lead bromide perovskite particles exhibited a narrow monochromatic band gap, which can be tuned by partial halide substitution, and PLQY up to 75% making this material an excellent candidate for light emission and display applications.
1. A method to synthesize metal halide perovskite particles, comprising:
providing a solution comprising lead bromide, a tetraalkylammonium bromide surfactant, wherein alkyl is an ethyl or higher group, and cesium bromide in a polar solvent, and
mixing a non-polar anti-solvent with the solution to precipitate Cs 4 PbBr 6 perovskite particles.
2. The method of claim 1 , wherein the tetraalkylammonium bromide surfactant comprises tetraethylammonium bromide, tetrabutylammonium bromide, or tetraoctylammonium bromide.
3. The method of claim 1 , wherein the polar solvent comprises dimethylformamide or tetrahydrofuran.
4. The method of claim 1 , wherein the non-polar anti-solvent comprises toluene or hexane.
5. The method of claim 1 , wherein the mixing comprises stirring.
6. The method of claim 1 , wherein the mixing comprises sonicating.