Lead‐Free Halide Double Perovskites: Structure, Luminescence, and Applications

Small StructuresVolume 2, Issue 3 2000071 Review Lead-Free Halide Double Perovskites: Structure, Luminescence, and Applications Ye Wu, Ye Wu orcid.org/0000-0002-7007-2160 MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics and Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094 ChinaSearch for more papers by this authorXiaoming Li, Xiaoming Li orcid.org/0000-0003-1795-0371 MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics and Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094 ChinaSearch for more papers by this authorHaibo Zeng, Corresponding Author Haibo Zeng zeng.haibo@njust.edu.cn orcid.org/0000-0002-0281-3617 MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics and Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094 ChinaSearch for more papers by this author Ye Wu, Ye Wu orcid.org/0000-0002-7007-2160 MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics and Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094 ChinaSearch for more papers by this authorXiaoming Li, Xiaoming Li orcid.org/0000-0003-1795-0371 MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics and Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094 ChinaSearch for more papers by this authorHaibo Zeng, Corresponding Author Haibo Zeng zeng.haibo@njust.edu.cn orcid.org/0000-0002-0281-3617 MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics and Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094 ChinaSearch for more papers by this author First published: 31 October 2020 https://doi.org/10.1002/sstr.202000071Citations: 41Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract Organic–inorganic halide perovskites have attracted extensive attention due to their excellent optoelectronic properties. However, the toxicity of heavy atom Pb2+ and instability overshadow further commercial applications, motivating researchers to explore alternative analogues to overcome these disadvantages. Lead-free halide double perovskites (HDPs), sharing similar crystal structures with organic–inorganic halide perovskites, are promising candidates for optoelectronic applications. However, HDPs possess unique properties that are uncommon in organic–inorganic halide perovskites deriving from feasible component engineering and strong electron–phonon interaction. Bright luminescence in HDPs originates from self-trapped excitons (STEs) and sensitized dopants can cover the full visible and near-infrared ray (NIR) gamut by modulating parity-forbidden transitions and the energy-transfer process. The superior optoelectronic characteristics of HDPs further extend applications on self-assembly, white-light phosphors, NIR bioimaging, and scintillators, in comparison to organic–inorganic halide perovskites. Herein, the structural diversity, tunable luminescence, photophysical mechanism of STEs, charge-carrier dynamics, size effect, and stability issues of HDPs are discussed. The challenges and outlook for further investigations are also given, which may help in discovering new analogues and boosting the photoluminescence quantum yield and stability of HDPs. Conflict of Interest The authors declare no conflict of interest. Citing Literature Volume2, Issue3March 20212000071 This article also appears in:Emerging Perovskite Materials and Applications RelatedInformation