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The internal mechanism on stability and electronic transitions of photoinduced radicals, is thus crucial for the development of relevant materials. Herein, a series of photoinduced radical emission systems were developed conveniently through doping benzoic acids into the hydrogen donor polyvinyl alcohol (PVA) matrix. Visual photoinduced radical emission and photochromism could be observed on\n                    <jats:bold>Ph\u20103COOH<\/jats:bold>\n                    @PVA film with the formation of cyclohexadienyl\u2010type structure. For the first time, radical afterglow appeared with energy transfer from triplet state. The appropriate introduction of carboxylic groups to three nonadjacent carbon atoms on the benzene ring was the best for decreasing spin population and promoting electronic transitions of the radical. This study largely expands the radical emission property from both internal mechanism and practical application.\n                  <\/jats:p>","DOI":"10.1002\/anie.202218994","type":"journal-article","created":{"date-parts":[[2023,3,29]],"date-time":"2023-03-29T14:24:59Z","timestamp":1680099899000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":46,"title":["Photo\u2010Response with Radical Afterglow by Regulation of Spin Populations and Hole\u2010Electron Distributions"],"prefix":"10.1002","volume":"62","author":[{"given":"Yujie","family":"Yang","sequence":"first","affiliation":[{"name":"Institute of Molecular Aggregation Science Tianjin University  300072 Tianjin China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiaqiang","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute of Molecular Aggregation Science Tianjin University  300072 Tianjin 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