锡基钙钛矿的研究进展及其在发光二极管中的应用

Lead halide perovskites have aroused widespread interest in recent years due to their superior optoelectronic properties, such as high absorption coefficient, high charge carrier mobility, high defect tolerance and high photoluminescence (PL) efficiency. However, one critical problem which potentially hampers their commercial applications is the toxicity caused by lead. To address this toxicity problem, a careful and strategic replacement of Pb²⁺ with other nontoxic candidate elements represents a promising direction. Tin (Sn), currently the most promising alternative to lead due to its structure and properties, has received extensiveattention. In this review, some recent developments of Sn-based perovskites and their applications in light-emitting diodes are summarized. Firstly, some synthesis methods of Sn-based perovskite materials are introduced. Then, the crystal structures and photoelectric properties of Sn-perovskites in different valence states are analyzed. Then, the potential application of Sn-based perovskite materials in light-emitting devices is presented and some methods to improve the performance of Sn-based PeLEDs are also summarized. Finally, the significant challenges in these Sn-based PeLEDs are pointed out and their possible solutions are suggested. It is expected that this review can conduce to an in-depth understanding of Sn-based halide materials and their application in PeLEDs.