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Rapid Commun."],"published-print":{"date-parts":[[2026,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Pure organic room\u2010temperature phosphorescence (RTP) polymers have attracted considerable attention for their promising applications in information encryption, anti\u2010counterfeiting, and flexible optoelectronics. Herein, we report a strategy combining physical blending and in situ covalent cross\u2010linking to fabricate processable RTP polymer blends with ultrawide mechanical tunability. Flowable precursors are first prepared by dispersing carbazole\u2010based phosphor\u2010doped polystyrene (PS) into polyethylene glycol (PEG), followed by cross\u2010linking of terminal hydroxyl groups to form a three\u2010dimensional polyurethane network that provides an excellent oxygen barrier and shape fixation. The optimized system exhibits bright yellow RTP with afterglow durations of 1.7\u20135.5 s, representing a 2\u20135\u2010fold enhancement compared with non\u2010cross\u2010linked systems. Impressively, Young's modulus can be precisely tuned over 9 orders of magnitude from \u223c10\n                    <jats:sup>\u22121<\/jats:sup>\n                    to \u223c10\n                    <jats:sup>8<\/jats:sup>\n                    \u00a0Pa. This work provides a universal and scalable route for developing moldable, mechanics\u2010tunable RTP polymers for advanced optical and anti\u2010counterfeiting applications.\n                  <\/jats:p>","DOI":"10.1002\/marc.70405","type":"journal-article","created":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T12:53:59Z","timestamp":1787230439000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Cross\u2010Linkable Room\u2010Temperature Phosphorescent Polymer Blends With Ultrawide Modulus Tunability"],"prefix":"10.1002","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-1612-9386","authenticated-orcid":false,"given":"Junhong","family":"Liang","sequence":"first","affiliation":[{"name":"School of Emergent Soft Matter South China University of Technology  Guangzhou China"},{"name":"Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices South China 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