Synthesis of high-efficient Mn2+ doped CsPbCl3 perovskite nanocrystals in toluene and surprised lattice ejection of dopants at mild temperature

Abstract

Doping has been established as a powerful approach for endowing novel properties to perovskite nanocrystals (NCs).However, the fast formation of perovskites makes the fundamental understanding of doping processes in these NCs very rare. In the present work, a mild temperature (<100 °C) approach to produce Mn2+ doped CsPbCl3 (Mn:CsPbCl3) perovskite NCs in toluene is reported. The effects of the introduced Mn/Pb ratios in the raw materials as well as the temperature on the structure and photoluminescence (PL) properties of Mn:CsPbCl3 NCs were investigated systematically. The as-synthesized Mn:CsPbCl3 NCs shown a strong Mn2+ emission at 594 nm with a PL quantum yield (QY) of 52%, and the doping concentrations can be easily tailored from 1.8 atom% to 13.3 atom% by changed the Mn/Pb feed ratios. The study revealed that the reaction temperature plays a key role in Mn:CsPbCl3 NCs. Through elemental and microstructure characterization, it was surprisingly found that lattice ejection of Mn ions occurred at 100 °C. This result greatly enhances the understanding of the “basic process” of Mn2+doping in CsPbCl3 NCs, which provides some insights into the preparation of metal ion doped perovskite NCs.