Perovskite spin light-emitting diodes with simultaneously high electroluminescence dissymmetry and high external quantum efficiency
Shuai He, Weixi Lin, De Yu, Junwei Shi, Yin Zhen, Changjiu Sun, Haoliang Liu, Chen Zhang, Jianyu Yuan, Sai Bai, Shumin Xiao, Guankui Long, Mingjian Yuan, Yuanzhi Jiang, Yimu Chen, Qinghai Song
Abstract
Realizing high electroluminescence dissymmetric factor and high external quantum efficiency at the same time is challenging in light-emitting diodes with direct circularly polarized emission. Here, we show that high electroluminescence dissymmetric factor and high external quantum efficiency can be simultaneously achieved in light-emitting diodes based on chiral perovskite quantum dots. Specifically, chiral perovskite quantum dots with chiral-induced spin selectivity can concurrently serve as localized radiative recombination centers of spin-polarized carriers for circularly polarized emission, thereby suppressing the relaxation of spins, Meanwhile, improving the chiral ligand exchange efficiency is found to synergistically promote their spin selectivity and optoelectronic properties so that chiroptoelectronic performance of resulting devices can be facilitated. Our device simultaneously exhibits high electroluminescence dissymmetric factor (R: 0.285 and S: 0.251) and high external quantum efficiency (R: 16.8% and S: 16%), demonstrating their potential in constructing high-performance chiral light sources. He et al. report spin-LEDs based on chiral perovskite quantum dots which act as localized spin-selective units and radiative recombination centers simultaneously. Ultrasonic treatment assisted ligand exchange enables spin-LEDs with peak efficiency of 16.8% and dissymmetry factor of 0.285.