Improvement of Photophysical Properties of CsPbBr₃ and Mn²⁺:CsPb(Br,Cl)₃ Perovskite Nanocrystals by Sr²⁺ Doping for White Light-Emitting Diodes

All-inorganic metal halide perovskite nanocrystals (NCs) having the general formula ABX3, where A is a monovalent cation, for example, Cs+, B divalent typically Pb2+, and X Cl–, Br–, I–, or their binary mixture, show potential in optoelectronic devices. In this work, we explore effect of B-site doping on properties CsPbX3 NCs (X = Br, Cl). First, Pb2+ ions pristine CsPbBr3 NC are partially substituted by Mn2+ ions. The alkaline earth strontium then doped both Mn2+-substituted NCs. We found that small percentage Sr2+ remarkably improves photoluminescence quantum yield Mn2+-state emission Mn2+:CsPb(Br,Cl)3 Perovskite film/poly(methyl methacrylate) composites with all four variants were used white light-emitting diode (WLED), increased luminous efficiency WLED ∼4.7%. attribute performance enhancement to reduced defect density an attenuated microstrain local structure.