Synergistic Effect of Dual Ligands on Stable Blue Quasi-2D Perovskite Light-Emitting Diodes
Yan Jin1, Zhao-Kui Wang,*, 1 Shuai Yuan,1 Qiang Wang,1 Chaochao Qin,2 Kai-Li Wang,1 Chong Dong,1 Meng Li,1 Yufang Liu,* 1 and Liang-Sheng Liao*, 1
1Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, China.
2Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, Henan Normal University, Xinxiang 453007, China
Since the emergence of inorganic–organic hybrid perovskites a few years ago, there have been many promising achievements in the feld 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 flms, which can exhibit stable blue-light emission, is utilized. The fabricated PeLEDs have a maximum external quantum effciency of 2.62% and a half lifetime (T50) of 8.8 min. Meanwhile, the electroluminescence spectrum with its peak located at 485 nm, demonstrates improved stability by applying different voltage bias. The fnding in this work offers a new way to achieve steady blue PeLEDs with high performance.