Recent Progress of Lead-free Metal Halide Perovskite Variant Luminescent Materials

Lead halide perovskite luminescent materials have attracted much attention due to their unique optoelec⁃ tronic advantages such as high fluorescence quantum yield, narrow emission spectrum, and adjustable emission wavelength. However, the toxicity of metal lead and the stability of perovskite are the problems that need to be solved in the practical application in the field of flat-panel display and solid-state lighting in the future. Therefore, it is an imperative trend to explore more green and environment-friendly lead-free metal halide perovskite luminescent materi⁃ als with the same optoelectronic properties as lead-based counterparts. In recent years, significant progress has been made in the research of lead-free metal halide perovskite variant (LFMHPV) luminescent materials. In this review, the crystal structure, preparation methods and luminescent mechanism of LFMHPVs are summarized. The factors af⁃ fecting the photoelectric properties of these materials are discussed, and their applications in the field of photolumi⁃ nescence and electroluminescence devices are categorized. Finally, how to further improve the performance of LFMHPV luminescent materials is summarized and prospected, which is conceived to provide useful guidelines for further design and application of novel metal halides with high performance.