| Summary: | Organic-inorganic perovskite quantum dots (PeQDs) have attracted attention due to their excellent optical properties, e.g., high photoluminescence quantum yields (PLQYs; >70%), a narrow full width at half maximum (FWHM; 25 nm or less), and color tunability adjusted by the halide components in an entire tunability (from 450 nm to 730 nm). On the other hand, PeQD stability against air, humidity, and thermal conditions has still not been enough, which disturbs their application. To overcome these issues, with just a focus on the air stability, Mn<sup>2+</sup> ion passivated perovskite quantum dots (Mn/MAPbBr<sub>3</sub> QDs) were prepared. Mn<sup>2+</sup> could be expected to contract the passivating layer against the air condition because the Mn<sup>2+</sup> ion was changed to the oxidized Mn on PeQDs under the air conditions. In this research, Mn/MAPbBr<sub>3</sub> QDs were successfully prepared by ligand-assisted reprecipitation (LARP) methods. Surprisingly, Mn/MAPbBr<sub>3</sub> QD films showed more than double PLQY stability over 4 months compared with pure MAPbBr<sub>3</sub> ones against the air, which suggested that oxidized Mn worked as a passivating layer. Improving the PeQD stability is significantly critical for their application.
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