Highly efficient green-emitting nanocrystals of MAPb1-xMnxBr3 perovskite with excellent thermal stability

Abstract Although organic-inorganic hybrid MAPbBr3 (CH3NH3+ = MA) perovskite nanocrystals (NCs) have outstanding optical properties, their toxicity and the low thermal stability seriously hinder the further application. Herein, the low-toxic MAPb1-xMnxBr3 NCs were synthesized by the modified ligand-assisted re-precipitation (LARP) approach at room temperature. The mixed-metal NCs exhibit high PLQYs (more than 93%) due to a certain amount of Mn2+ doping effectively inhibits the non-radiative recombination, and thus improves the optical performance. The as-synthesized perovskite NCs also show excellent thermal stability because of the elimination of structural distortion by Mn2+-doping. The fast anion exchange of Mn2+-doped perovskite NCs effectively extends their photoluminescence to the whole visible spectral region. Interestingly, a novel dual-emission was observed in MAPb1-xMnx(I/Br)3 (x = 0.3) perovskite NCs due to the phase separation.