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Here we report a tetraborated B,N\u2010embedded [9]helicene, B\n                    <jats:sub>4<\/jats:sub>\n                    ONA, constructed through\n                    <jats:italic>ortho<\/jats:italic>\n                    \u2010diboron reinforcement of a multiple\u2010resonance framework. Structural and theoretical analyses reveal that the\n                    <jats:italic>ortho<\/jats:italic>\n                    \u2010diboron configuration strengthens helical rigidity and excited\u2010state confinement, thereby suppressing structural relaxation and vibronic coupling. B\n                    <jats:sub>4<\/jats:sub>\n                    ONA exhibits pure\u2010blue emission at 462\u00a0nm with a full width at half\u2010maximum (FWHM) of 20\u00a0nm and pronounced chiroptical activity, reaching a high photoluminescence dissymmetry factor of 5.03 \u00d7 10\n                    <jats:sup>\u22123<\/jats:sup>\n                    in the emissive film. Organic light\u2010emitting diodes (OLEDs) based on B\n                    <jats:sub>4<\/jats:sub>\n                    ONA deliver pure\u2010blue electroluminescence at 464\u00a0nm with a FWHM of 21\u00a0nm and external quantum efficiencies of up to 34.4%, ranking among the best performances reported to date for blue CP\u2010MR\u2010TADF OLEDs. These findings establish\n                    <jats:italic>ortho<\/jats:italic>\n                    \u2010diboron reinforcement of high\u2010order B,N\u2010embedded helicenes as an effective molecular design strategy for CP\u2010MR\u2010TADF emitters.\n                  <\/jats:p>","DOI":"10.1002\/anie.1030078","type":"journal-article","created":{"date-parts":[[2026,7,29]],"date-time":"2026-07-29T14:03:46Z","timestamp":1785333826000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Vicinal\u2010Diboron Reinforced [9]Helicene Enables Narrowband Blue Circularly Polarized Emitter With Large Dissymmetry Factor and High Device Efficiency"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-7687-1959","authenticated-orcid":false,"given":"Tao","family":"Hua","sequence":"first","affiliation":[{"name":"Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University  Shenzhen P. R. China"},{"name":"Institute of Technology for Future Industry School of Science and Technology Instrument Application Engineering Shenzhen University of Information Technology  Shenzhen P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1763-1912","authenticated-orcid":false,"given":"Chen","family":"Cao","sequence":"additional","affiliation":[{"name":"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":"Zhanxiang","family":"Chen","sequence":"additional","affiliation":[{"name":"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\/0000-0002-7553-6964","authenticated-orcid":false,"given":"Zhongyan","family":"Huang","sequence":"additional","affiliation":[{"name":"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":"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":"Nengquan","family":"Li","sequence":"additional","affiliation":[{"name":"Institute of Technology for Future Industry School of Science and Technology Instrument Application Engineering Shenzhen University of Information Technology  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":"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"}]}],"member":"311","published-online":{"date-parts":[[2026,7,29]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010025\u201058355\u20108"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.adt3011"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ccr.2022.214640"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202423077"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201800198"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/cjoc.202400843"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202516088"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.6b02463"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202511414"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010024\u201001508\u2010w"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201505491"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010019\u20100476\u20105"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010022\u201001106\u20108"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202301018"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010024\u201055680\u20102"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202107951"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202310047"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1093\/nsr\/nwag377"},{"key":"e_1_2_8_20_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202515889"},{"key":"e_1_2_8_21_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202518651"},{"key":"e_1_2_8_22_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202100652"},{"key":"e_1_2_8_23_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11426\u2010024\u20102355\u20100"},{"key":"e_1_2_8_24_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.scib.2024.11.048"},{"key":"e_1_2_8_25_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202407277"},{"key":"e_1_2_8_26_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202204253"},{"key":"e_1_2_8_27_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202305125"},{"key":"e_1_2_8_28_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202105080"},{"key":"e_1_2_8_29_1","doi-asserted-by":"publisher","DOI":"10.1039\/D3SC05171D"},{"key":"e_1_2_8_30_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202506328"},{"key":"e_1_2_8_31_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201811706"},{"key":"e_1_2_8_32_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.orglett.1c01212"},{"key":"e_1_2_8_33_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202218494"},{"key":"e_1_2_8_34_1","doi-asserted-by":"publisher","DOI":"10.31635\/ccschem.022.202101661"},{"key":"e_1_2_8_35_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202307420"},{"key":"e_1_2_8_36_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201912340"},{"key":"e_1_2_8_37_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.5b03118"},{"key":"e_1_2_8_38_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202510190"},{"key":"e_1_2_8_39_1","doi-asserted-by":"publisher","DOI":"10.1039\/D3CS00837A"},{"key":"e_1_2_8_40_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202517999"},{"key":"e_1_2_8_41_1","doi-asserted-by":"publisher","DOI":"10.1039\/D4SC03854A"},{"key":"e_1_2_8_42_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202401835"},{"key":"e_1_2_8_43_1","doi-asserted-by":"publisher","DOI":"10.1002\/inf2.12652"},{"key":"e_1_2_8_44_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202511560"},{"key":"e_1_2_8_45_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202308314"},{"key":"e_1_2_8_46_1","unstructured":"Deposition numbers 2528810 (for B4ONA) contain the supplementary crystallographic data for this paper. 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