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Herein, two emitters, 8NN\u20101B and 8NN\u20102B, are developed based on diaza\u2010octagon\u2013containing emitting core (8NN) through the incorporation of multiple boron\/nitrogen (B\/N) units. Building upon the inherent MR characteristics and saddle\u2010shaped configuration of the 8NN matrix, the boron\u2010locked derivatives exhibit a markedly enhanced MR effect along with attractive aggregation\u2010induced emission and aggregation\u2010narrowed emission properties. Through rational regulation of electronic effects, their singlet\u2010triplet energy splitting values are significantly reduced, while the spatially twisted conformation for the diaza\u2010octagon heterocycle enhances spin\u2013orbit coupling. Consequently, the reverse intersystem crossing rate in 8NN\u20102B is boosted up to 7.7 \u00d7 10\n                    <jats:sup>5<\/jats:sup>\n                    s\n                    <jats:sup>\u22121<\/jats:sup>\n                    , and its sensitizer\u2010free device achieves a high maximum EQE of 32.20% with negligible efficiency roll\u2010off at 1000\u00a0cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    luminance. Notably, such high efficiency is well maintained even at a high doping concentration of 10\u00a0wt%, owing to suppressed molecular packing induced by the 8NN matrix. These results highlight a mutual modification strategy that exploits the complementary strengths of the diaza\u2010octagon core and BN framework for high\u2010performance narrowband emitters.\n                  <\/jats:p>","DOI":"10.1002\/anie.3011418","type":"journal-article","created":{"date-parts":[[2026,5,5]],"date-time":"2026-05-05T10:43:07Z","timestamp":1777977787000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Boron\u2010Locked Diaza\u2010Octagon Strategy for Constructing Multi\u2010Resonance Emitters Enabling Anti\u2010Quenching Narrowband OLEDs With High Efficiency and Low Efficiency Roll\u2010Off"],"prefix":"10.1002","volume":"65","author":[{"given":"Yadong","family":"Qu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates Center for Aggregation\u2010Induced Emission AIE Institute South China University of Technology  Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chenfa","family":"Xiao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates Center for Aggregation\u2010Induced Emission AIE Institute South China University of Technology  Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Baoxi","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates Center for Aggregation\u2010Induced Emission AIE Institute South China University of Technology  Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luyao","family":"Liu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of 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