Surface Ligand Engineering of Mn²⁺-Doped CsPbCl₃ Perovskite Nanocrystals with Ascorbic Acid

Halide perovskite quantum dots (QDs) have earned an excellent reputation as superior optoelectronic components. However, lead makes them poisonous, which seriously limits their ability to be used. They are attractive for light-emitting applications since the emission color can be adjusted across the visible spectral band. Doping transition metal ions like Mn2+ into the perovskite QDs can reduce lead toxicity, further influencing the optical and magnetic properties. The presence of the defect states and the Mn-Mn dimer formation do not allow the enhancement of the photoluminescence (PL) quantum yield and stability of the Mn-doped CsPbCl3 perovskite nanocrystal. Therefore, this study investigated the effects of post-treatment of Mn-doped CsPbCl3 nanocrystals treated with ascorbic acid to increase their PL and long-term durability. We have recorded PL data for untreated and ascorbic acid-treated Mn-doped CsPbCl3 perovskite nanocrystals up to 30 days after every 5 days. The ascorbic acid-treated Mn-doped CsPbCl3 perovskite nanocrystals exhibit outstanding ambient stability and photostability.