High-Performance Green Light-Emitting Diodes Based on MAPbBr with π-Conjugated Ligand.

The morphology, crystal size, and trap density of perovskite films significantly affect the luminescent properties of perovskite light-emitting diodes (PeLEDs). Recently, numerous studies have been conducted on ligands that surround the surface of perovskite crystals and passivate the trap sites to improve the performance of PeLEDs. In this study, a 4-aminobenzonitrile (ABN) ligand improved the performance of methylammonium lead bromide (MAPbBr)-based PeLEDs by reducing the MAPbBr crystal size to the nanoscale and reducing the trap density.