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However, molecular design has largely focused on guest molecules, while\u00a0host screening lacks\u00a0systematic theoretical guidance. Here, we propose a host dearomatization strategy that prolongs the afterglow of doped systems. By converting the benzene ring into a cyclohexane structure in the host, the RTP lifetimes of the doped systems are significantly prolonged, with the maximum enhancement reaching a 58.65\u2010fold increase. Mechanistic studies indicate that the extended lifetime arises from enhanced triplet\u2010triplet energy transfer and electronic coupling, enabled by the reduced intermolecular distance upon dearomatization. This strategy exhibits universality across diverse host and guest systems. These doped systems are further applied in time\u2010resolved information encryption systems and switchable adhesive materials. Starting from the host molecular framework, this study provides a universal and efficient strategy for the rational design of organic RTP materials.<\/jats:p>","DOI":"10.1002\/anie.6451405","type":"journal-article","created":{"date-parts":[[2026,8,5]],"date-time":"2026-08-05T15:05:18Z","timestamp":1785942318000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Host Dearomatization for Prolonging Room\u2010Temperature Phosphorescence"],"prefix":"10.1002","volume":"65","author":[{"given":"Jialin","family":"Qin","sequence":"first","affiliation":[{"name":"Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic Chemistry Institute of Fine Chemicals School of Chemistry and Molecular Engineering East China University of Science and Technology  Shanghai 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