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However, most state\u2010of\u2010the\u2010art organic RTP systems suffer from short lifetimes, low quantum efficiency, and severe nonradiative quenching under ambient conditions, greatly limiting practical applications. Herein, we develop a robust host\u2013guest confinement strategy to achieve efficient ultra\u2010long\u2010lived red RTP by incorporating three newly designed acrylonitrile\u2010based luminophores (Cz\u2010Cz, Cz\u2010Py, and Cz\u2010DiPy) into a rigid PMMA matrix. All doped films show intense and stable red RTP emission; the Cz\u2010DiPy@PMMA composite affords a remarkable lifetime of 260.32\u2009ms, nearly three orders of magnitude higher than pristine powder. Mechanistic studies combined with theoretical calculations reveal that the rigid PMMA framework restricts intramolecular motions, suppresses nonradiative relaxation, and shields triplet excitons from oxygen and collisional quenching, synergistically improving RTP performance. Enabled by excellent long\u2010afterglow properties, these films are successfully applied to time\u2010resolved multi\u2010level information encryption and advanced anti\u2010counterfeiting. This work provides a universal route to high\u2010performance red\u2010emissive organic RTP materials and offers valuable mechanistic insights to advance their deployment in next\u2010generation information security and optoelectronic technologies.<\/jats:p>","DOI":"10.1002\/bio.70580","type":"journal-article","created":{"date-parts":[[2026,7,20]],"date-time":"2026-07-20T02:02:42Z","timestamp":1784512962000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Boosting Red Room\u2010Temperature Phosphorescence by Host\u2013Guest Confinement: Acrylonitrile Derivatives in PMMA Toward Long\u2010Lived Afterglow and Anti\u2010Counterfeiting"],"prefix":"10.1002","volume":"41","author":[{"given":"Hong","family":"Chen","sequence":"first","affiliation":[{"name":"Guangxi Key Laboratory of Electrochemical and Magneto\u2010Chemical Functional Materials, College of Materials Science and Engineering, College of Chemistry and Bioengineering Guilin University of Technology  Guilin P. 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