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To overcome this limitation, we propose a strategy that immobilizes silicon nanodots (SiNDs) within a dual\u2010functional composite matrix. The SiNDs efficiently generate abundant triplet excitons through intersystem crossing processes and simultaneously exhibit high PhQYs. Importantly, the urea\u2010paraformaldehyde\u2010derived matrix provides both the spatial confinement of molten urea and the extensive hydrogen\u2010bonding network of the urea\u2010formaldehyde resin. This synergistic configuration effectively immobilizes triplet excitons and suppresses nonradiative decay pathways. As a result, the material exhibits a remarkable PhQY of 81.04% together with an ultralong afterglow lifetime of 3.44 s. Furthermore, the energy transfer strategy further extends the persistent afterglow into the deep\u2010red region (702\u00a0nm). Leveraging the tunable afterglow colors and time\u2010resolved luminescent characteristics, an artificial intelligence\u2010assisted information encryption system was successfully developed. This work demonstrates that integrating SiNDs with a dual\u2010characteristic matrix provides a promising approach to concurrently achieving high PhQYs and ultralong lifetimes, thereby broadening the application scope of ultralong\u2010afterglow materials and guiding the rational design of next\u2010generation persistent luminescence materials.<\/jats:p>","DOI":"10.1002\/advs.202522820","type":"journal-article","created":{"date-parts":[[2026,1,20]],"date-time":"2026-01-20T12:16:06Z","timestamp":1768911366000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Urea\u2010Formaldehyde Resin Confined Silicon Nanodots Composites: High\u2010Performance and Ultralong Persistent Luminescence for Dynamic AI Information Encryption"],"prefix":"10.1002","volume":"13","author":[{"given":"Yulu","family":"Liu","sequence":"first","affiliation":[{"name":"Department of Biomaterials and Stem Cells Suzhou Institute of Biomedical Engineering and Technology Chinese Academy of Science (CAS)  Suzhou P. 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