Highly Efficient and Stable Eu³⁺-Doped CsPbBr₃ /Cs₄ PbBr₆ Perovskites for White Light-Emitting Diodes

All-inorganic halide perovskite nanomaterials have a high application potential in the field of display and lighting because of unique photoelectric properties. However, these materials suffer from problems related to poor water and thermal stabilities. In this study, green Eu³⁺-doped CsPbBr₃ /Cs₄ PbBr₆ perovskite composites that were synthesized by a saturated recrystallization method at room temperature showed an enhanced photoluminescence quantum yield of 87% and superior water and thermal stabilities to that of undoped perovskites. Finally, green Eu³⁺-doped CsPbBr₃ /Cs₄ PbBr₆ perovskite composites were fabricated into white light-emitting diodes (WLEDs) with a wide color gamut (124% of the National Television System Committee standard) and a high efficiency of 43.06 lm/W.