Stable and multicolor solid-state luminescence of Mn doped CsPb(Cl/Br)3 perovskite quantum dots and its application in light-emitting diodes

Mn2+ doping has been developed to modulate the photoluminescence (PL) of CsPbCl3 perovskite quantum dots (PQDs). However, the doped Mn2+ may be expelled from the PQDs host with the long-term storing, resulting in inferior stability. Herein, CsPbCl3 PQDs doped with different concentrations of Mn2+ (Mn:CsPbCl3) are prepared by a hot injection method. Our photostability tests reveal that when the doping concentration is <25%, or 40%- 50%, the Mn2+ doped PQDs are intrinsically stable. Anion exchange reactions are conducted between the stable CsPb0.796Mn0.204Cl3 and CsPbBr3 PQDs. Fluorescence color gamut of the resulting Mn:CsPb(Cl/Br)3 PQDs almost covers the entire visible spectrum except for the deep red color. Benefiting from the intrinsic stability and wide color gamut, multicolor solid-state luminescence are acquired by incorporating the Mn:CsPb(Cl/Br)3 PQDs in polymethyl methacrylate (PMMA) matrices, which are used as color converters for constructing light-emitting diodes (LEDs) with different colors.

Automated summary

Mn2+ doping in CsPbCl3 perovskite quantum dots affects their photoluminescence, with stable properties observed at certain doping concentrations. Anion exchange reactions between stable CsPb0.796Mn0.204Cl3 and CsPbBr3 PQDs result in a wide fluorescence color gamut for Mn:CsPb(Cl/Br)3 PQDs.