Blue-emitting NH4+-doped MAPbBr3 perovskite quantum dots with near unity quantum yield and super stability

Abstract

Novel NH₄⁺-doped MA_1−x(NH₄)_xPbBr₃ perovskite quantum dots were synthesized at room temperature. The introduction of NH₄⁺ results in larger lattice formation energy and better crystallinity of MA_1−x(NH₄)_xPbBr₃, which greatly reduces the defect density and inhibits non-radiative recombinations, and thus helps in achieving excellent stability and near unity blue-emitting photoluminescence quantum yields.