Multidentate Ligand-Passivated CsPbI<sub>3</sub> Perovskite Nanocrystals for Stable and Efficient Red-Light-Emitting Diodes
Jianbin Zhang, Wei Shen, Shuo Chen, Shuo Chen, Zixuan Zhang, Bo Cai, Yue Qiu, Yi Liu, Jiayu Jiang, Yanxing He, Nan Meng, Yanfeng Chen, Zhan Su, Yujun Dai, Lihui Liu, Shufen Chen, Shufen Chen
Abstract
CsPbI 3 nanocrystals (NCs) have become a research hot spot in the field of light-emitting diodes (LEDs). Whereas, the long chain ligands with weak affinity to CsPbI 3 NCs have prevented their further development and commercialization. Herein, a novel multidentate short ligand tetramethylthiuram disulfide (TMTD) was employed via a ligand exchange process to enhance hole mobility and decrease trap density of the CsPbI 3 NCs film. Therefore, TMTD passivated CsPbI 3 NCs LED exhibited 20.65% maximum external quantum efficiency and 3861 cd/m 2 maximum luminance. Furthermore, TMTD passivated CsPbI 3 NCs LED exhibited good operational stability with a 128 min half-lifetime. This strategy using multidentate short ligand passivation provides an effective way to promote perovskite LED development and commercialization.