Enhanced Mn emission and high photoluminescence quantum yield of Mn2+ doped CsPbCl3 nanocrystals

CsPbX 3 (X = Cl, Br, I) perovskites have been recognized as ideal candidates for light-emitting device applications due to their excellent optoelectronic properties, but the toxicity of lead has raised significant environmental concerns. Mn doping in lead-based perovskite nanocrystals (NCs) has been conducted to mitigate lead toxicity risks while enhancing photoluminescent performance. While high Mn concentrations can increase Mn–Mn defect states, complicating the balance between high photoluminescence quantum yield (PLQY) and low lead. In this study, a PLQY of 85.8% was achieved by precisely controlling the Mn/Pb feed ratio at a concentration of 11.37%. The enhancement in PLQY is attributed to reduced Cl vacancies, which lower defect states and non-radiative recombination rates. Stability was also improved through doping, and white light emitting diode (WLED) utilizing these materials exhibited color coordinates (0.3379, 0.3479) that closely approximate standard white light emission. This work provides a solution for achieving high-quality Mn 2+ doped perovskite NCs, and highlights its potential in solid-state lighting solutions while addressing lead toxicity concerns.