Improved Ultraviolet Radiation Stability of Mn2+ Doped CsPbCl3 Nanocrystals via B-site Sn Doping

Creating highly ultraviolet irradiation stability of luminescent Mn2+ doped all-inorganic halide perovskite nanocrystals (NCs) is challenging because their optical properties depend on their ionic structure and its inherent defects. Herein, we present a facile and effective synthesis using a B-site Sn doping strategy to grow Mn2+ doped CsPbCl3 (Mn:CsPbCl3) NCs with enhancement of ultraviolet irradiation stability and emission efficiencies. The Mn:CsPbCl3 NCs were prepared by tailoring the amount of SnCl2 addition during the growth of NCs. The element and microstructure analysis revealed that Sn ions were successfully doped into the host NC lattice and had the valence state of +2. With the increase of Sn doping content, the doping efficiency of Mn ions increased and the photoluminescence (PL) intensity of NCs was enhanced. The optimum synthesis of Mn:CsPbCl3 NCs was obtained at Sn/Mn/Pb molar ratio of 1/1/1, and the PL quantum efficiency reached 43%. More importantly, with increasing ultraviolet illumination times, the almost unchanged single exponential decay times of Mn2+ emissions and the slow reduction of PL intensities of Mn:CsPbCl3 NCs were found after introduced Sn doping, indicating that Sn doping can significantly improve the ultraviolet irradiation stability of Mn:CsPbCl3 NCs.