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However, most existing systems rely on inert atmospheres, high irradiation intensities, or prolonged exposure times, severely limiting printing efficiency and practical applicability. Here we report a molecular design paradigm that fundamentally redefines the functional role of multiple\u2010resonance thermally activated delayed fluorescence (MR\u2010TADF) materials, transforming them from efficient light emitters into highly active triplet photocatalysts through selenium\u2010atom engineering. By integrating carbonyl\u2010assisted n\u2013\u03c0*\/\u03c0\u2013\u03c0* state coupling with selenium\u2010induced spin\u2010orbit enhancement, the resulting photocatalyst\n                    <jats:bold>QPSO<\/jats:bold>\n                    achieves a near\u2010unity intersystem crossing quantum yield together with an exceptionally large forward\u2010to\u2010reverse intersystem crossing rate constant ratio, thus efficiently channeling exciton flux into long\u2010lived, redox\u2010active triplet states. When combined with a hypervalent iodonium co\u2010initiator, this system enables rapid photopolymerization in ambient air using low\u2010intensity blue light. As a result, single\u2010layer curing is completed within only 1.5\u20132\u00a0s across a broad thickness range, affording a printing resolution down to 10\u00a0\u00b5m and a record\u2010high build speed of up to 72\u00a0cm h\n                    <jats:sup>\u22121<\/jats:sup>\n                    at 400\u00a0\u00b5m layer thickness. The platform supports the fabrication of complex hierarchical architectures while exhibiting excellent biocompatibility.\n                  <\/jats:p>","DOI":"10.1002\/anie.8320434","type":"journal-article","created":{"date-parts":[[2026,5,19]],"date-time":"2026-05-19T17:42:09Z","timestamp":1779212529000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Selenium\u2010Atom\u2010Enhanced Triplet Exciton Kinetics in MR\u2010TADF Photocatalysts for Ultrafast, High\u2010Resolution, and Open\u2010Air 3D Printing"],"prefix":"10.1002","volume":"65","author":[{"given":"Yuyang","family":"Tang","sequence":"first","affiliation":[{"name":"Key Laboratory of Green Chemistry and Technology of Ministry of Education College of Chemistry Sichuan University  Chengdu People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuanzhi","family":"Xu","sequence":"additional","affiliation":[{"name":"Key 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