Tuneable Efficient White Emission of Sb³⁺/Mn²⁺ Co-Doped Lead-Free Perovskites for Single-Component White Light-Emitting Diodes

Abstract

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 Sb³⁺/Mn²⁺ ions to achieve the tuneable dual emission in lead-free perovskite Cs₃InCl₆ NCs. The PLQY increases to 59.64% after doping with Sb³⁺. The codoped Cs₃InCl₆ NCs exhibit efficient white light emission due to the energy transfer channel from STEs to Mn²⁺ ions with PLQY of 51.38%. Density functional theory (DFT) calculations have been used to verify deeply the effects of Sb³⁺/Mn²⁺ doping. WLEDs based on Sb³⁺/Mn²⁺-codoped Cs₃InCl₆ 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.