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In particular, B,N\u2010embedded heterohelicenes achieve superior exciton utilization via multiple\u2010resonance thermally activated delayed fluorescence, whereas their syntheses remain challenging. Herein, we present a facile strategy of one\u2010step intermolecular oxidative coupling and cyclodehydration to achieve the concise synthesis of a B,N,O\u2010embedded hetero[9]helicene (\n                    <jats:bold>BNFN<\/jats:bold>\n                    ).\n                    <jats:bold>BNFN<\/jats:bold>\n                    exhibits narrowband green photoluminescence peaking at 516\u00a0nm with a rapid reverse intersystem crossing rate (3.76\u00a0\u00d7\u00a010\n                    <jats:sup>5<\/jats:sup>\n                    \u00a0s\n                    <jats:sup>\u22121<\/jats:sup>\n                    ), and the enantiomers display intense CPL with dissymmetry factors (\n                    <jats:italic>g<\/jats:italic>\n                    <jats:sub>PL<\/jats:sub>\n                    ) of +2.4\/\u22122.6\u00a0\u00d7\u00a010\n                    <jats:sup>\u22123<\/jats:sup>\n                    . Corresponding circularly polarized organic light\u2010emitting diodes (CP\u2010OLEDs) deliver CIE coordinates of (0.20, 0.72) and\n                    <jats:italic>g<\/jats:italic>\n                    <jats:sub>EL<\/jats:sub>\n                    of +3.4\/\u22123.3\u00a0\u00d7\u00a010\n                    <jats:sup>\u22123<\/jats:sup>\n                    . Notably, these devices demonstrate maximum external quantum efficiencies of 31.3%\/30.2% and low efficiency roll\u2010off. This work paves the way toward the development of a novel B,N\u2010embedded heterohelicene for efficient CP\u2010OLEDs.\n                  <\/jats:p>","DOI":"10.1002\/anie.8789956","type":"journal-article","created":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T06:53:13Z","timestamp":1789541593000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["One\u2010Step Intermolecular Oxidative Coupling and Cyclodehydration Strategy for Pure\u2010Green B,N,O\u2010Embedded Hetero[9]Helicene Emitter"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-4146-4434","authenticated-orcid":false,"given":"Jun\u2010Wei","family":"Xu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Nanjing University  Nanjing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hong\u2010Xu","family":"Wei","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Nanjing University  Nanjing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Li","family":"Yuan","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Nanjing University  Nanjing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yi\u2010Fan","family":"Yang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Nanjing University  Nanjing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-1603-9274","authenticated-orcid":false,"given":"Yu","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Nanjing University  Nanjing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jia\u2010Zhen","family":"Zhu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Nanjing University  Nanjing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1219-8926","authenticated-orcid":false,"given":"Jing\u2010Lin","family":"Zuo","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Nanjing University  Nanjing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1795-2492","authenticated-orcid":false,"given":"You\u2010Xuan","family":"Zheng","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Nanjing University  Nanjing P. R. 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