Synergistic Effect of Dual Ligands on Stable Blue Quasi-2D Perovskite Light-Emitting Diodes

Since the emergence of inorganic-organic hybrid perovskites a few years ago, there have been many promising achievements in the field of green and red perovskite light-emitting diodes (PeLEDs). Nevertheless, the performance of blue-light PeLEDs faces challenges. In this work, the unique synergy obtained by introducing two different ligands to successfully form quasi-2D perovskite films, which can exhibit stable blue-light emission, is utilized. The fabricated PeLEDs have a maximum external quantum efficiency of 2.62% and a half lifetime (T-50) of 8.8 min. Meanwhile, the electroluminescence spectrum with its peak located at 485 nm, demonstrates improved stability by applying different voltage bias. The finding in this work offers a new way to achieve steady blue PeLEDs with high performance.