Pressure-Induced Emission Enhancements of Mn²⁺-Doped Cesium Lead Chloride Perovskite Nanocrystals

Metal-halide perovskites (MHPs) have attracted tremendous attention because of their excellent performance in photovoltaic devices, such as solar cells. However, because of the crucial relationship between emission intensity and performance, pressure-quenching of optical emission greatly restrict the potential application of MHPs. Here, we reported the unique pressure-induced emission enhancement (PIEE) of CsPb_xMn_1–xCl₃ NCs. Different from other PIEE phenomena, the PIEE of CsPb_xMn_1–xCl₃ NCs was caused by the enhancement of energy release from ⁴T₁ to ⁶A₁ of the Mn, attributed to the pressure-induced isostructural phase transition. Meanwhile, the photoluminescence (PL) can exist until almost 20 GPa, suggesting that CsPb_xMn_1–xCl₃ NCs exhibited better environmental suitability and worked under high pressure. Our studies explored the relationship between bandgap microstructure and optical properties of CsPb_xMn_1–xCl₃ NCs at high pressure and also gave insights into the optimization of photovoltaic performance, which promoting the design of functional MHPs.