Homogeneous Synthesis and Electroluminescence Device of Highly Luminescent CsPbBr₃ Perovskite Nanocrystals

Highly luminescent CsPbBr₃ perovskite nanocrystals (PNCs) are homogeneously synthesized by mixing toluene solutions of PbBr₂ and cesium oleate at room temperature in open air. We found that PbBr₂ can be easily dissolved in nonpolar toluene in the presence of tetraoctylammonium bromide, which allows us to homogeneously prepare CsPbBr₃ perovskite quantum dots and prevents the use of harmful polar organic solvents, such as N,N-dimethylformamide, dimethyl sulfoxide, and N-methyl-2-pyrrolidone. Additionally, this method can be extended to synthesize highly luminescent CH₃NH₃PbBr₃ perovskite quantum dots. An electroluminescence device with a maximal luminance of 110 cd/m² has been fabricated by using high-quality CsPbBr₃ PNCs as the emitting layer.