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The CNQDs are synthesized via a facile solvent\u2010free thermolysis of biuret and display a blue LPL lasting over 1.5 h under ambient conditions. Upon heating to 150\u00b0C, intense UV HTA and TL emissions are generated. Mechanistic studies reveal that aggregation\u2010associated \u03c0\u2013\u03c0 stacking stabilizes triplet excitons, while aggregation\u2010stabilized defect\u2010related paramagnetic centers promote carrier capture and long\u2010term energy storage, with deeper traps serving as reservoirs for thermally activated release. Reverse intersystem crossing further transfers de\u2010trapped carriers from triplet to singlet excited states, resulting in a pronounced blue\u2010shift of the HTA and TL emissions into the UV region. Owing to the stability of the aggregates and their protective effect on excited states and trapped charges, the luminescence remains robust in aqueous dispersions, while the invisible UV TL signals remain clearly detectable after more than 15 days under ambient conditions. Leveraging these characteristics, we demonstrate applications in highly concealed information storage and high\u2010contrast bioimaging. This work establishes an aggregation\u2010induced defect\u2010engineering strategy for energy\u2010storage luminescent materials and opens a new pathway toward self\u2010embedded LPL\/TL systems.<\/jats:p>","DOI":"10.1002\/anie.5306487","type":"journal-article","created":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T04:19:38Z","timestamp":1791519578000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Defect Engineering via Aggregation: Unlocking Hour\u2010Long Afterglow and UV Thermoluminescence in Self\u2010Embedded Carbon Nitride Quantum Dots"],"prefix":"10.1002","author":[{"given":"Hao","family":"Cui","sequence":"first","affiliation":[{"name":"International Joint Research Center for Photo\u2010responsive Molecules and Materials School of Chemical and Material Engineering Jiangnan University  Wuxi 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