锡基钙钛矿的研究进展及其在发光二极管中的应用

Recent progress of tin-based perovskites and their applications in light-emitting diodes

卤化铅钙钛矿由于具有高吸收系数、高载流子迁移率、高缺陷容忍度和高光致发光效率等优越的光电子性能,近年来引起了人们的广泛关注.然而,可能阻碍其商业应用的关键是铅元素的存在引起的毒性问题.为了解决这一毒性问题,谨慎而有策略地用其他无毒候选元素替代Pb2+是一个很有前途的方向.锡具有和铅相似的结构和性质,是目前最有希望替代铅的元素,这也引起了研究者们广泛的兴趣及进一步的研究.本文综述了近年来锡基钙钛矿的研究进展及其在发光二极管中的应用.首先,介绍了一些适合应用于发光二极管的锡基钙钛矿材料的合成方法.然后,分析了不同价态下锡基钙钛矿的晶体结构和光电性质.在此基础上讨论了锡基钙钛矿材料在发光器件中的应用,并总结了提高锡基钙钛矿性能的一些措施.最后提出了锡基钙钛矿当前遇到的重大挑战,并提出了可能的解决方案,有助于实现高性能锡基卤化物钙钛矿发光二极管.基于这篇综述,以期对锡基卤化物材料及其在发光二极管中的应用有深入了解,进而推动锡基钙钛矿发光二极管的发展.

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 Pb^2+ 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.