Tuneable Efficient White Emission of Sb/Mn Co-Doped Lead-Free Perovskites for Single-Component White Light-Emitting Diodes.

Inorganic lead-free perovskite nanocrystals (NCs) with broadband self-trapped exciton (STEs) emission and low toxicity have shown enormous application prospects in the field of display and lighting. However, white light-emitting diodes (WLEDs) based on a single-component material with high photoluminescence quantum yield (PLQY) remain challenging. Here, we demonstrate a novel codoping strategy by introducing Sb/Mn ions to achieve the tuneable dual emission in lead-free perovskite CsInCl NCs. The PLQY increases to 59.64% after doping with Sb. The codoped CsInCl NCs exhibit efficient white light emission due to the energy transfer channel from STEs to Mn ions with PLQY of 51.38%. Density functional theory (DFT) calculations have been used to verify deeply the effects of Sb/Mn doping. WLEDs based on Sb/Mn-codoped CsInCl NCs are explored with color rendering index of 85.5 and color coordinate of (0.398, 0.445), which have been successfully applied as photodetector lighting sources. This work provides a new perspective for designing novel lead-free perovskites to achieve single-component WLEDs.