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Nevertheless, luminescence thermal quenching severely limits the efficiency and operating stability in TADF materials and devices at high temperature. Herein, a surface engineering strategy is adopted to obtain unique carbon dots (CDs)\u2010based thermally enhanced TADF materials with \u2248250% enhancement from 273 to 343\u00a0K via incorporating seed CDs into ionic crystal network. The rigid crystal network can simultaneously boost reverse intersystem crossing process via enhancing spin\u2010orbit coupling between singlet and triplet states and suppressing non\u2010radiative transition rate, contributing to the thermally enhanced TADF character. Benefiting from efficient energy transfer from triplet states of phosphorescence center to singlet states of CDs, TADF emission at \u2248600\u00a0nm in CDs displays a long lifetime up to 109.6\u00a0ms, outperforming other red organic TADF materials. Thanks to variable decay rates of the delayed emission centers, time and temperature\u2010dependent delayed emission color has been first realized in CDs\u2010based delayed emission materials. The CDs with thermally enhanced and time\u2010\/temperature\u2010dependent emission in one material system can offer new opportunities in information protection and processing.<\/jats:p>","DOI":"10.1002\/adma.202211858","type":"journal-article","created":{"date-parts":[[2023,3,9]],"date-time":"2023-03-09T18:44:55Z","timestamp":1678387495000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":194,"title":["Thermally Enhanced and Long Lifetime Red TADF Carbon Dots via Multi\u2010Confinement and Phosphorescence Assisted Energy Transfer"],"prefix":"10.1002","volume":"35","author":[{"given":"Qing","family":"Lou","sequence":"first","affiliation":[{"name":"State Centre for International Cooperation on Designer Low\u2010Carbon &amp; Environmental Materials School of Materials Science and Engineering Zhengzhou University  Zhengzhou 450001 P. R. 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