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While \u03c0\u2010conjugated framework expansion has been extensively explored for tuning excited\u2010state properties, five\u2010boron MR\u2010TADF emitters have not yet been realized. Herein, we report the first five\u2010boron MR\u2010TADF emitter, M\u2010DABNA\u2010Mes, featuring an unprecedented odd\u2010numbered boron\u2010rich multiple\u2010resonance framework. Theoretical investigations of one\u2010, three\u2010, and five\u2010boron MR frameworks reveal that incorporation of the fifth boron atom reduces the singlet\u2013triplet energy gap, preserves spin\u2013orbit coupling, and reduces the total reorganization energy while maintaining favorable narrowband emission characteristics. Consistent with these predictions, M\u2010DABNA\u2010Mes doped in a polystyrene film exhibits a sub\u2010microsecond delayed fluorescence lifetime (\n                    <jats:italic>\u03c4<\/jats:italic>\n                    <jats:sub>TADF<\/jats:sub>\n                    = 0.93 \u00b5s), a reverse intersystem crossing rate of 2.6 \u00d7 10\n                    <jats:sup>6<\/jats:sup>\n                    s\n                    <jats:sup>\u22121<\/jats:sup>\n                    , and narrow green emission at 512\u00a0nm with a full width at half maximum of 19\u00a0nm. OLEDs based on M\u2010DABNA\u2010Mes achieve a maximum external quantum efficiency of 34.3% with remarkably low efficiency roll\u2010off (32.3% at 10,000\u00a0cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    ) and a maximum luminance of 275,800\u00a0cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    . These results demonstrate that the five\u2010boron MR framework enables rapid spin conversion, high spectral purity, and excellent OLED performance, providing a new platform for high\u2010performance MR\u2010TADF emitters.\n                  <\/jats:p>","DOI":"10.1002\/anie.3413163","type":"journal-article","created":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T08:33:01Z","timestamp":1789029181000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Five\u2010Boron Multiple\u2010Resonance TADF Emitter With Accelerated Reverse Intersystem Crossing for High\u2010Performance Narrowband Green OLEDs"],"prefix":"10.1002","volume":"65","author":[{"given":"Taehwan","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Chemistry Graduate School of Science Kyoto University  Kyoto 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Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7483-9525","authenticated-orcid":false,"given":"Takuji","family":"Hatakeyama","sequence":"additional","affiliation":[{"name":"Department of Chemistry Graduate School of Science Kyoto University  Kyoto 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Numbers 2578948 (forM\u2010DABNA\u2010Mes) Contain the Supplementary Crystallographic Data for This Paper. These Data Are Provided Free of Charge by the Joint Cambridge Crystallographic Data Centre and Fachinformationszentrum Karlsruhe Access Structures Service."},{"key":"e_1_2_8_37_1","doi-asserted-by":"publisher","DOI":"10.1039\/c1jm13417e"},{"key":"e_1_2_8_38_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201705600"},{"key":"e_1_2_8_39_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.orgel.2013.07.010"},{"key":"e_1_2_8_40_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja510144h"},{"key":"e_1_2_8_41_1","doi-asserted-by":"publisher","DOI":"10.1038\/ncomms9476"}],"container-title":["Angewandte Chemie International Edition"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/anie.3413163","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/full-xml\/10.1002\/anie.3413163","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/anie.3413163","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,10,26]],"date-time":"2026-10-26T16:29:51Z","timestamp":1793032191000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/anie.3413163"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9,10]]},"references-count":40,"journal-issue":{"issue":"44","published-print":{"date-parts":[[2026,10,26]]}},"alternative-id":["10.1002\/anie.3413163"],"URL":"https:\/\/doi.org\/10.1002\/anie.3413163","archive":["Portico"],"relation":{},"ISSN":["1433-7851","1521-3773"],"issn-type":[{"value":"1433-7851","type":"print"},{"value":"1521-3773","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,9,10]]},"assertion":[{"value":"2026-06-27","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-09-02","order":2,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-09-10","order":3,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}],"article-number":"e3413163"}}