Lead-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 doublep erovskite (LFDP) structure because of its unique electronic dimensions, chemical stability,a nd substitutionalc hemistry compared with other lead-free structures. We highlighted the recent progress on crystal structure prediction, synthesis methods, metal dopants, and ligand passivationo nL FDPs. LFDPs are useful for severala pplications,s uch as solar cells, light-emitting diodes, degradation of photocatalytic dyes, sensors, and X-ray detectors. This report provides as ummary of recent progress as ar eference for further research on lead-freep erovskite structures.The ORCID identification number(s) for the author(s) of this articlecan be found under: https://doi.