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

Although organic-inorganic hybrid MAPbBr(3) (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 MAPb(1-x)Mn(x)Br(3) 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 MAPb(1-x)Mn(x)(I/Br)(3) (x = 0.3) perovskite NCs due to the phase separation.

Automated summary

Low-toxic MAPb(1-x)Mn(x)Br(3) NCs were synthesized using a modified ligand-assisted re-precipitation approach, with the Mn2+ doping effectively improving optical performance and enhancing photoluminescence quantum yields. The thermal stability was also enhanced by Mn2+ doping, and fast anion exchange extended the photoluminescence to the visible spectral region. Additionally, a novel dual-emission was observed in MAPb(1-x)Mn(x)(I/Br)(3) NCs due to phase separation.