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Their development, however, is often hindered by enhanced excited\u2010state relaxation and inefficient triplet\u2010exciton utilization. Here, we report a conformationally locked, saddle\u2010shaped pentaboron\u2010embedded B,N\u2010doped nanographene, PB\u2010U. Its rigid skeleton and multiple\u2010resonance electronic structure suppress structural reorganization, while its saddle\u2010shaped framework promotes spin\u2010orbit coupling and facilitates reverse intersystem crossing. As a result, PB\u2010U exhibits green emission in toluene with a full\u2010width at half\u2010maximum of 17\u00a0nm, a photoluminescence quantum yield of 98%, and efficient thermally activated delayed fluorescence (TADF) with a reverse intersystem crossing rate of 3.6\u00a0\u00d7\u00a010\n                    <jats:sup>6<\/jats:sup>\n                    \u00a0s\n                    <jats:sup>\u22121<\/jats:sup>\n                    . The corresponding non\u2010sensitized OLEDs deliver a maximum external quantum efficiency (EQE) of 35.3% with significantly reduced efficiency roll\u2010off, sustaining an EQE of 26.6% even at 10\u00a0000\u00a0cd\u00a0m\n                    <jats:sup>\u22122<\/jats:sup>\n                    . Beyond efficient narrowband emission, PB\u2010U shows appreciable affinity with C\n                    <jats:sub>60<\/jats:sub>\n                    through its concave \u03c0\u2010surface as demonstrated by their cocrystal structure. These findings identify conformational locking as an effective strategy to exploit both the photophysical and interfacial advantages of curved structure while enabling narrowband, efficient TADF emission.\n                  <\/jats:p>","DOI":"10.1002\/anie.8498677","type":"journal-article","created":{"date-parts":[[2026,8,31]],"date-time":"2026-08-31T05:02:59Z","timestamp":1788152579000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Curved B,N\u2010Doped Nanographene Beyond Narrowband Emission"],"prefix":"10.1002","volume":"65","author":[{"given":"Shengbing","family":"Xiao","sequence":"first","affiliation":[{"name":"Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University  Shenzhen P. R. China"},{"name":"College of Physical and Optoelectronic Engineering Shenzhen University  Shenzhen P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoyu","family":"Guo","sequence":"additional","affiliation":[{"name":"Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University  Shenzhen P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiahui","family":"Liu","sequence":"additional","affiliation":[{"name":"Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University  Shenzhen P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-0268-0427","authenticated-orcid":false,"given":"Jingsheng","family":"Miao","sequence":"additional","affiliation":[{"name":"Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University  Shenzhen P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9999-8840","authenticated-orcid":false,"given":"Xiaosong","family":"Cao","sequence":"additional","affiliation":[{"name":"Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University  Shenzhen P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9337-3460","authenticated-orcid":false,"given":"Chuluo","family":"Yang","sequence":"additional","affiliation":[{"name":"Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University  Shenzhen P. R. 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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_54_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00894\u2010021\u201004884\u20100"},{"key":"e_1_2_8_55_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586\u2010024\u201007149\u2010x"},{"key":"e_1_2_8_56_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202201778"},{"key":"e_1_2_8_57_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202208378"},{"key":"e_1_2_8_58_1","doi-asserted-by":"publisher","DOI":"10.1039\/c6cc03888c"},{"key":"e_1_2_8_59_1","doi-asserted-by":"publisher","DOI":"10.1038\/353147a0"},{"key":"e_1_2_8_60_1","doi-asserted-by":"publisher","DOI":"10.1002\/jcc.26812"}],"container-title":["Angewandte Chemie International Edition"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/anie.8498677","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/full-xml\/10.1002\/anie.8498677","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/anie.8498677","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,10,17]],"date-time":"2026-10-17T17:41:36Z","timestamp":1792258896000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/anie.8498677"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,8,30]]},"references-count":59,"journal-issue":{"issue":"43","published-print":{"date-parts":[[2026,10,19]]}},"alternative-id":["10.1002\/anie.8498677"],"URL":"https:\/\/doi.org\/10.1002\/anie.8498677","archive":["Portico"],"relation":{},"ISSN":["1433-7851","1521-3773"],"issn-type":[{"value":"1433-7851","type":"print"},{"value":"1521-3773","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,8,30]]},"assertion":[{"value":"2026-06-29","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-08-21","order":2,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-08-30","order":3,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}],"article-number":"e8498677"}}