Perovskite nanocrystal based highly efficient light-emitting diodes with post-synthetic ligand treatment

Abstract

We demonstrate the highly efficient light-emitting diodes based on CsPbBr3 perovskite nanocrystal with post-synthetic ligand treatment. Since olelyamine which is the conventionally used surface ligand in perovskite nanocrystal was unstable at the surface, the quaternary ammonium bromide types were applied to the nanocrystal surface. With the bulkiness control of the quaternary ammonium bromide, we optimizes the stability of the perovskite nanocrystal. Further, we optimizes the length of the ligands to achieve the highly efficient light-emitting diodes.