Efficient inverted green perovskite light-emitting diodes with high-quality perovskite film

Metal halide perovskites have the advantages of solution processing, high photoluminance quantum efficiency, and high charge carrier mobility. They are widely used in the field of Light-Emitting Diodes (LEDs). Inverted iodized-based perovskite LEDs (PeLEDs) with zinc oxide-based Electron Transporting Layers (ETLs) show high efficiency and long lifetime. However, the bromine-based type shows low device efficiency. The main challenge lies in the preparation of high-quality bromine-based perovskites on the zinc oxide-based ETLs. In this study, we controlled the component ratios in the bromine-based perovskite precursor to realize high-quality bromine-based perovskites on the ZnMgO ETL and achieved green PeLED with a peak External Quantum Efficiency (EQE) of 14.45%.