Emerging new‐generation white light‐emitting diodes based on luminescent lead‐free halide perovskites and perovskite derivatives
Zhuangzhuang Ma, Xinzhen Ji, Meng Wang, Xu Chen, Di Wu, Xinjian Li, Chongxin Shan, Zhifeng Shi
Abstract
Abstract Phosphor‐converting white light‐emitting diodes (WLEDs) are promising and particularly appealing solid‐state light sources, which are expected to change the way we light our homes and businesses. Lead‐halide perovskites have recently received extensive research attention as a new class of phosphors in WLEDs owing to their high photoluminescence quantum yield, tunable fluorescence emission, and the facile processing technique. However, the stability issues and the lead toxicity of such perovskites severely restrict their commercialization and practical applications. In this review, we first present a discussion on the recently developed luminescent lead‐free halide perovskites and perovskite derivatives by discussing their various design routes and emission mechanisms. Second, we introduce and compare three types of phosphor‐converting WLEDs with different cell configurations, and then discuss the recent advances and limitations in WLEDs based on lead‐free metal‐halide materials. Finally, we highlight current existing challenges and future development directions for developing high‐performance WLEDs.