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Herein, a novel design strategy is reported for realizing high\u2010efficiency oxygen\u2010bridged cyclized boron\u2010based MR\u2010TADF emitters via engineering intermolecular packing mode. Three organic donor\u2013acceptor (D\u2013A) molecules with different molecular configurations are designed and synthesized, which can readily form modulated packing patterns with fastidiously regulating intermolecular charge transfer (CT) in crystalline states. Experimental and theoretical investigations expose that the intermolecular D\u2013A packing modes could be formed in relatively planar molecular architecture, which cannot only fix the intermolecular CT excited\u2010state configuration, but the multiple conversion channels of triplet excitons can also be involved synergistically to accelerate the spin\u2010flip, and thus achieving near\u2010unity PLQY and excellent reverse intersystem crossing rate of 6.7\u00a0\u00d7\u00a010\n                    <jats:sup>5<\/jats:sup>\n                    s\n                    <jats:sup>\u22121<\/jats:sup>\n                    in solid states. The optimized OLEDs devices achieve an attractive EQE value of 31.75%, which is at a record high for MR\u2010TADF OLEDs with deep\u2010blue emission. Our strategy boosts the luminescence efficiency of MR\u2010TADF emitters through enabling the participation of multiple triplet states and the confined excited\u2010state conformations induced by intermolecular CT interaction in aggregation state.\n                  <\/jats:p>","DOI":"10.1002\/anie.202513129","type":"journal-article","created":{"date-parts":[[2025,7,30]],"date-time":"2025-07-30T06:43:56Z","timestamp":1753857836000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Engineering Intermolecular Packing Mode of Oxygen\u2010Bridged Cyclized Boron\u2010Based MR\u2010TADF Emitters Enables High\u2010Efficiency Deep\u2010Blue Narrowband OLEDs"],"prefix":"10.1002","volume":"64","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9088-3852","authenticated-orcid":false,"given":"Yuchao","family":"Liu","sequence":"first","affiliation":[{"name":"Department Key Laboratory of Rubber\u2010Plastics, Ministry of Education\/Shandong Provincial Key Laboratory of Rubber\u2010Plastics, School of Polymer Science and Engineering\/State Key Laboratory of Advanced Optical Polymer and Manufacturing Technology Qingdao University of Science &amp; Technology  Qingdao 266042 P.R. 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