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Helicene-based circularly polarized multiple resonance thermally activated delayed fluorescence (CP-MR-TADF) emitters combine intrinsic chirality with narrowband emission, but extending their emission to longer wavelengths is often accompanied by significant spectral broadening and a loss of configurational stability. Here, we introduce a BN[7]helicene framework that addresses these issues. Using an ortho-B\u2212\u03c0\u2013B topology, we construct an all-six-membered-ring-fused structure whose enantiomeric solid powders retain configurational stability and CPL performance after continuous heating at 250 \u00b0C for 6 days. The enantiomers (\u00a0P\u00a0\/\u00a0M\u00a0)-DBN-\u00a0cp\u00a0ICz exhibit yellow emission at 558 nm with a full-width at half-maximum (FWHM) of 23 nm, photoluminescence dissymmetry factors of +2.2\/\u20131.9 \u00d7 10\u20133 and an energy barrier of racemization of 48.28 kcal mol\u20131. CP-OLEDs based on (\u00a0P\u00a0\/\u00a0M\u00a0)-DBN-\u00a0cp\u00a0ICz achieve narrowband CPEL at 572 nm, with FWHM\u2019s of 29\u201330 nm and dissymmetry factors of +2.1\/\u20132.3 \u00d7 10\u20133. This work establishes a viable route toward long-wavelength, high-color-purity circularly polarized luminescence with enhanced configurational stability for robust chiral MR optoelectronic materials.<\/jats:p>","DOI":"10.1021\/jacs.6c10817","type":"journal-article","created":{"date-parts":[[2026,8,5]],"date-time":"2026-08-05T17:04:29Z","timestamp":1785949469000},"page":"34877-34887","source":"Crossref","is-referenced-by-count":2,"title":["An\n                    <i>Ortho<\/i>\n                    -B\u2212\u03c0\u2013B-Fused\nAll-Six-Membered BN[7]Helicene for Narrowband Circularly Polarized\nLuminescence with Robust Configurational Stability"],"prefix":"10.1021","volume":"148","author":[{"given":"Linjie","family":"Li","sequence":"first","affiliation":[{"name":"Jilin University , , , ,","place":["Changchun, Jilin, China, 130012"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lixiao","family":"Guo","sequence":"additional","affiliation":[{"name":"Jilin University , , , ,","place":["Changchun, Jilin, China, 130012"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4163-0802","authenticated-orcid":true,"given":"Yincai","family":"Xu","sequence":"additional","affiliation":[{"name":"Jilin University , , , ,","place":["Changchun, Jilin, China, 130012"]},{"name":"The University of British Columbia , , , ,","place":["Vancouver, British Columbia, Canada, V6T 1Z1"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yupei","family":"Qu","sequence":"additional","affiliation":[{"name":"Jilin University , , , ,","place":["Changchun, Jilin, China, 130012"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6936-5081","authenticated-orcid":true,"given":"Yue","family":"Wang","sequence":"additional","affiliation":[{"name":"Jilin University , , , ,","place":["Changchun, Jilin, China, 130012"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2523-6151","authenticated-orcid":true,"given":"Chenglong","family":"Li","sequence":"additional","affiliation":[{"name":"Jilin University , , , ,","place":["Changchun, Jilin, China, 130012"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8033-4136","authenticated-orcid":true,"given":"Zachary M.","family":"Hudson","sequence":"additional","affiliation":[{"name":"The University of British Columbia , , , ,","place":["Vancouver, British Columbia, Canada, V6T 1Z1"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,8,5]]},"reference":[{"key":"2026081910240583700_cit1","doi-asserted-by":"publisher","first-page":"1463","DOI":"10.1021\/cr200087r","article-title":"Helicenes: Synthesis and Applications","volume":"112","author":"Shen","year":"2012","journal-title":"Chem. 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Mater."},{"key":"2026081910240583700_cit7","doi-asserted-by":"publisher","first-page":"3463","DOI":"10.31635\/ccschem.022.202101661","article-title":"Simple Double\nHetero[5]helicenes Realize Highly Efficient and Narrowband\nCircularly Polarized Organic Light-Emitting Diodes","volume":"4","author":"Yang","year":"2022","journal-title":"CCS Chem."},{"key":"2026081910240583700_cit8","doi-asserted-by":"publisher","DOI":"10.1093\/nsr\/nwaf250","article-title":"Narrowband Deep-Blue Emission from\na BN-Embedded Cyclophane: Synthesis, Characterization, and OLED Application","volume":"12","author":"Fan","year":"2025","journal-title":"Natl. Sci. Rev."},{"key":"2026081910240583700_cit9","doi-asserted-by":"publisher","first-page":"1064","DOI":"10.1016\/j.scib.2026.01.021","article-title":"Multi-Resonance Emitters with Phosphorus-Bridged\nCyclization: Spectral Narrowing Synergized with Accelerated Reverse\nIntersystem Crossing","volume":"71","author":"Fan","year":"2026","journal-title":"Sci. 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Soc."},{"key":"2026081910240583700_cit25","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202513987","article-title":"Increasing Aromaticity\nin Selenium-Embedded Hetero Ring Enables Stable\nNarrowband Multi-Resonance TADF Emitter for Long-Lifetime Pure-Green\nOLEDs","volume":"38","author":"Liu","year":"2026","journal-title":"Adv. Mater."},{"key":"2026081910240583700_cit26","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202218965","article-title":"Efficient\nNarrowband Circularly Polarized Light Emitters Based on 1,4-B,N-Embedded\nRigid Donor\u2013Acceptor Helicenes","volume":"62","author":"Zhang","year":"2023","journal-title":"Angew.\nChem., Int. Ed."},{"key":"2026081910240583700_cit27","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202501645","article-title":"\u03c0-Extended\nHeli(aminoborane)s with Highly Bright Circularly\nPolarized Luminescence and Narrowband Emission","volume":"64","author":"Yu","year":"2025","journal-title":"Angew. Chem., Int. 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Mater."},{"key":"2026081910240583700_cit32","doi-asserted-by":"publisher","first-page":"5694","DOI":"10.1039\/D5SC08405A","article-title":"Unraveling the Positive\nEffect of Twisted Helicene Structure on Narrowband Electroluminescence","volume":"17","author":"Du","year":"2026","journal-title":"Chem. Sci."},{"key":"2026081910240583700_cit33","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202517999","article-title":"Aza-Heptagon\nHeterocycle Embedded B,N-Hetero[8]Helicene Toward Efficient Narrowband\nCircularly Polarized Electroluminescence","volume":"36","author":"Zhao","year":"2026","journal-title":"Adv.\nFunct. Mater."},{"key":"2026081910240583700_cit34","doi-asserted-by":"publisher","DOI":"10.1002\/adom.202502776","article-title":"Indolocarbazole\nFused B,N-Embedded [9]Helicene Exhibiting Fast Reverse Intersystem\nCrossing for Efficient Circularly Polarized Electroluminescence","volume":"13","author":"Guo","year":"2025","journal-title":"Adv. Opt. Mater."},{"key":"2026081910240583700_cit35","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202511560","article-title":"Pure-Green Circularly\nPolarized Multiple Resonance Thermally Activated Delayed Fluorescence\nEnantiomers with Discontinuous Fused Benzene Rings","volume":"38","author":"Li","year":"2026","journal-title":"Adv. Mater."},{"key":"2026081910240583700_cit36","doi-asserted-by":"publisher","first-page":"29782","DOI":"10.1021\/jacs.4c11404","article-title":"Ultra-Narrowband Circularly\nPolarized Luminescence from Multiple 1,4-Azaborine-Embedded Helical\nNanographenes","volume":"146","author":"Zhang","year":"2024","journal-title":"J. Am. Chem. Soc."},{"key":"2026081910240583700_cit37","doi-asserted-by":"publisher","first-page":"17958","DOI":"10.1021\/jacs.1c09058","article-title":"B,N-Embedded\nDouble Hetero[7]helicenes\nwith Strong Chiroptical Responses in the Visible Light Region","volume":"143","author":"Li","year":"2021","journal-title":"J. Am. Chem. Soc."},{"key":"2026081910240583700_cit38","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202406497","article-title":"Nonalternant B,N-Embedded\nHelical Nanographenes Containing Azepines: Programmable Synthesis,\nResponsive Chiroptical Properties and Spontaneous Resolution into\na Single-Handed Helix","volume":"63","author":"Zhuang","year":"2024","journal-title":"Angew. Chem., Int. Ed."},{"key":"2026081910240583700_cit39","doi-asserted-by":"publisher","first-page":"11539","DOI":"10.1039\/D5SC01958C","article-title":"Spiro-Fluorene\nLocked Multi-Resonance Delayed Fluorescence Helical Framework: Efficient\nCircularly Polarized Electroluminescent Materials","volume":"16","author":"Cai","year":"2025","journal-title":"Chem. 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Sci."},{"key":"2026081910240583700_cit43","doi-asserted-by":"publisher","first-page":"2804","DOI":"10.1007\/s11426-024-2355-0","article-title":"Recent Progress\nin Circularly Polarized Multi-Resonance Thermally Activated Delayed\nFluorescence Materials for Organic Light-Emitting Diodes","volume":"68","author":"Jiang","year":"2025","journal-title":"Sci. China Chem."},{"key":"2026081910240583700_cit44","doi-asserted-by":"publisher","first-page":"4922","DOI":"10.1039\/D4CS00745J","article-title":"Chiral\nNanographenes Exhibiting Circularly Polarized\nLuminescence","volume":"54","author":"Kumar","year":"2025","journal-title":"Chem. Soc. Rev."},{"key":"2026081910240583700_cit45","doi-asserted-by":"publisher","first-page":"7408","DOI":"10.1039\/D4SC01083C","article-title":"Boron-Containing\nHelicenes as New\nGeneration of Chiral Materials: Opportunities and Challenges of Leaving\nthe Flatland","volume":"15","author":"Nowak-Kro\u0301l","year":"2024","journal-title":"Chem. Sci."},{"key":"2026081910240583700_cit46","doi-asserted-by":"publisher","first-page":"19468","DOI":"10.1021\/jacs.0c10081","article-title":"Full-Color,\nNarrowband, and High-Efficiency\nElectroluminescence from Boron and Carbazole Embedded Polycyclic Heteroaromatics","volume":"142","author":"Yang","year":"2020","journal-title":"J. Am. Chem. Soc."},{"key":"2026081910240583700_cit47","doi-asserted-by":"publisher","DOI":"10.1002\/adom.202302987","article-title":"Efficient Ultra-Narrowband OLEDs\nBased on Carbazole-Fused Dual-Boron Embedded Multi-Resonance Thermally\nActivated Delayed Fluorescence Materials","volume":"12","author":"Hu","year":"2024","journal-title":"Adv.\nOpt. 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