Dave KFang M.HBao ZFu H.TRU-SHI LIU2021-08-032021-08-03202018614728https://www.scopus.com/inward/record.uri?eid=2-s2.0-85077065833&doi=10.1002%2fasia.201901510&partnerID=40&md5=adfe12973b4eec348a1a89d58cbb2dc0https://scholars.lib.ntu.edu.tw/handle/123456789/575829Lead-free perovskite structures have been recently attracting considerable attention because of their eco-friendly nature and properties, such as their lead-based structure. In this work, we reviewed the lead-free double perovskite (LFDP) structure because of its unique electronic dimensions, chemical stability, and substitutional chemistry compared with other lead-free structures. We highlighted the recent progress on crystal structure prediction, synthesis methods, metal dopants, and ligand passivation on LFDPs. LFDPs are useful for several applications, such as solar cells, light-emitting diodes, degradation of photocatalytic dyes, sensors, and X-ray detectors. This report provides a summary of recent progress as a reference for further research on lead-free perovskite structures. ? 2019 Wiley-VCH Verlag GmbH & Co. KGaA, WeinheimApplications; Chelation; Chemical stability; Doping (additives); Perovskite; Photodegradation; X ray detectors; Crystal structure prediction; Double perovskites; Lead-Free; Lead-free perovskites; Ligand passivation; Photo-catalytic; Substitutional chemistry; Synthesis method; Crystal structure[SDGs]SDG7review10.1002/asia.201901510317941552-s2.0-85077065833