Trivalent-Neodymium Additive Modulated MAPbBr(3) Perovskite Nucleation and Growth: Ultrawide Processing Window for One-Step Fabrication of Efficient Light-Emitting Perovskites

Hybrid metal halide perovskite-based light-emitting diodes and lasers have demonstrated outstanding performance and currently lead a new trend in the optoelectronic field; however, the widely used one-step spin-coating method assisted by an antisolvent suffers from the narrow processing window of antisolvents, which limits its further use in commercial applications. The present work incorporates trivalent-neodymium ions (Nd3+) into methylammonium lead tribromide (MAPbBr(3)) perovskite thin films to control nucleation and crystal growth, achieving an ultrabroad processing window of 18 s, significantly larger than the conventional processing window of 3-5 s. A sixfold enhanced photoluminescence quantum yield (PLQY) and an excellent stability of at least 8 months in ambient conditions is also demonstrated. The results provide a deeper understanding of the nucleation and growth process of ion-incorporated perovskites and demonstrate an effective strategy to overcome the narrow processing window limit.