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Herein, carbonyl units are fused into a multi\u2010boron\n                    <jats:italic>v<\/jats:italic>\n                    \u2010DABNA framework to construct B\/N\/C\u2550O hybrid MR\u2010TADF emitters. Within this framework, the electron\u2010withdrawing carbonyl units stabilize the lowest unoccupied molecular orbital and narrow the bandgap, enabling a bathochromic shift while preserving the alternating frontier\u2010orbital distribution required for narrowband emission. Meanwhile, the carbonyl\u2010associated partial n\u2013\u03c0* contribution to the excited states enhances spin\u2013orbit coupling and accelerates RISC. The resultant emitters, CO\u2010\n                    <jats:italic>v<\/jats:italic>\n                    \u2010DABNAMe and CO\u2010\n                    <jats:italic>v<\/jats:italic>\n                    \u2010DABNAPh, exhibit green emission peaking at 503 and 508\u00a0nm with narrow full widths at half\u2010maximum of only 21\u00a0nm, together with high\n                    <jats:italic>k<\/jats:italic>\n                    <jats:sub>RISC<\/jats:sub>\n                    values exceeding 5.0 \u00d7\u00a010\n                    <jats:sup>5<\/jats:sup>\n                    \u00a0s\n                    <jats:sup>\u22121<\/jats:sup>\n                    . Binary OLEDs based on CO\u2010\n                    <jats:italic>v<\/jats:italic>\n                    \u2010DABNAMe and CO\u2010\n                    <jats:italic>v<\/jats:italic>\n                    \u2010DABNAPh deliver pure\u2010green electroluminescence with Commission Internationale de l\u2019\u00c9clairage coordinates of (0.18, 0.72) and (0.19, 0.73), accompanied by maximum external quantum efficiencies of 35.3% and 36.2%, respectively. Notably, ultralow efficiency roll\u2010offs of only 3.4% and 3.9% are achieved at 1000\u00a0cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , representing well\u2010balanced overall performance among binary pure\u2010green MR\u2010TADF OLEDs reported to date.\n                  <\/jats:p>","DOI":"10.1002\/anie.5771174","type":"journal-article","created":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T04:04:36Z","timestamp":1788926676000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Carbonyl\u2010Locking Strategy for Multi\u2010Resonance Emitters Enables Efficient Pure\u2010Green OLEDs With Ultralow Efficiency Roll\u2010Off"],"prefix":"10.1002","volume":"65","author":[{"given":"Pingping","family":"Zheng","sequence":"first","affiliation":[{"name":"State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University  Changchun People's Republic of China"},{"name":"Interdisciplinary Innovation Center Jilin University  Changchun People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-7260-508X","authenticated-orcid":false,"given":"Linjie","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University  Changchun People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haitao","family":"Wu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University  Changchun People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weibo","family":"Cui","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University  Changchun People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-7141-3822","authenticated-orcid":false,"given":"Lixiao","family":"Guo","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University  Changchun People's Republic of China"},{"name":"Interdisciplinary Innovation Center Jilin University  Changchun People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2523-6151","authenticated-orcid":false,"given":"Chenglong","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University  Changchun People's Republic of 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