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However, their performance suffers from thermal quenching at high temperatures. While inorganic matrices like boric acid provide rigidity to suppress molecular vibrations, their high\u2010temperature processing hinders organic dopant incorporation and color control. Here, we report a strategy combining a low\u2010temperature processed boric acid matrix with triplet\u2010to\u2010singlet F\u00f6rster resonance energy transfer (FRET) to achieve high\u2010temperature LPMs with tunable colors. Doping triphenylboronic acid (TPBA) into boric acid and heating at 120\u00b0C for 4\u00a0h forms a crystalline metaborate network that confines TPBA, giving a phosphorescence lifetime up to 2.56\u00a0s at 460\u00a0K. This framework suppresses vibrational loss and enables stable triplet exciton capture\/release even at elevated temperatures. Adding Rhodamine\u00a06G as an acceptor establishes efficient FRET from blue\u2013green phosphorescence to red fluorescence. The afterglow color can be precisely tuned by varying acceptor concentration or temperature, leveraging their distinct quenching rates. This mild synthesis avoids dopant decomposition, expands organic\u2013inorganic hybrid FRET systems, and provides a simple route to thermally stable, multicolor LPMs.<\/jats:p>","DOI":"10.1002\/smll.202513015","type":"journal-article","created":{"date-parts":[[2026,1,20]],"date-time":"2026-01-20T12:36:22Z","timestamp":1768912582000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["High\u2010Temperature Afterglow Color Tuning via F\u00f6rster Resonance Energy Transfer"],"prefix":"10.1002","volume":"22","author":[{"given":"Guanxing","family":"Lao","sequence":"first","affiliation":[{"name":"Guangxi Key Laboratory of Optical and Electronic Materials and Devices Guangxi Colleges and Universities Key Laboratory of Natural and Biomedical Polymer Materials College of Materials Science and Engineering Guilin University of Technology  Guilin 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Colleges and Universities Key Laboratory of Natural and Biomedical Polymer Materials College of Materials Science and Engineering Guilin University of Technology  Guilin China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yinyin","family":"Zhu","sequence":"additional","affiliation":[{"name":"Guangxi Key Laboratory of Optical and Electronic Materials and Devices Guangxi Colleges and Universities Key Laboratory of Natural and Biomedical Polymer Materials College of Materials Science and Engineering Guilin University of Technology  Guilin China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu\u2010Ang","family":"Yin","sequence":"additional","affiliation":[{"name":"Guangxi Key Laboratory of Optical and Electronic Materials and Devices Guangxi Colleges and Universities Key Laboratory of Natural and Biomedical Polymer Materials College of Materials Science and Engineering Guilin University of Technology  Guilin China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bingli","family":"Jiang","sequence":"additional","affiliation":[{"name":"Guangxi Key Laboratory of Drug Discovery and Optimization College of Pharmacy Guilin Medical University  Guilin China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoli","family":"Wu","sequence":"additional","affiliation":[{"name":"Guangxi Key Laboratory of Optical and Electronic Materials and Devices Guangxi Colleges and Universities Key Laboratory of Natural and Biomedical Polymer Materials College of Materials Science and Engineering Guilin University of Technology  Guilin China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1226-7170","authenticated-orcid":false,"given":"Yongyang","family":"Gong","sequence":"additional","affiliation":[{"name":"Guangxi Key Laboratory of Optical and Electronic Materials and Devices Guangxi Colleges and Universities Key Laboratory of Natural 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