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Here, a novel molecular engineering strategy is introduced by replacing helicene containing continuous fused benzene rings with a multiple resonance (MR) framework comprising discontinuous fused benzene rings. This approach effectively suppresses high\u2010frequency C\u2500C bond stretching vibrations and enhances short\u2010range charge transfer, enabling high color purity, CPL activity, and efficient thermally activated delayed fluorescence (TADF). The proof\u2010of\u2010concept green BN[7]helicene\u2010based emitters (\n                    <jats:italic>P<\/jats:italic>\n                    \/\n                    <jats:italic>M<\/jats:italic>\n                    )\u2010DBN\u2010\n                    <jats:italic>m<\/jats:italic>\n                    ICz display bright and narrowband green emission peaking at 512\u00a0nm with a full\u2010width at half\u2010maximum (FWHM) of 25\u00a0nm. Notably, the enantiomers (\n                    <jats:italic>P<\/jats:italic>\n                    )\u2010 and (\n                    <jats:italic>M<\/jats:italic>\n                    )\u2010DBN\u2010\n                    <jats:italic>m<\/jats:italic>\n                    ICz exhibit narrowband CPL spectra with FWHMs of 26 and 25\u00a0nm, the Commission Internationale de l'\u00c9clairage (CIE) coordinates of (0.14, 0.72) and (0.15, 0.72), and photoluminescence dissymmetry factors of +2.3\u00a0\u00d7\u00a010\n                    <jats:sup>\u22123<\/jats:sup>\n                    and \u22122.6\u00a0\u00d7\u00a010\n                    <jats:sup>\u22123<\/jats:sup>\n                    . (\n                    <jats:italic>P<\/jats:italic>\n                    )\u2010 and (\n                    <jats:italic>M<\/jats:italic>\n                    )\u2010DBN\u2010\n                    <jats:italic>m<\/jats:italic>\n                    ICz\u2010based CP\u2010OLEDs deliver pure\u2010green emission, characterized by a peak wavelength of 516\u00a0nm, a narrow FWHM of 27\u00a0nm, and CIE coordinates of (0.17, 0.72), representing the purest green CP\u2010OLEDs reported to date. Furthermore, these devices exhibit high electroluminescence dissymmetry factors of +5.3\u00a0\u00d7\u00a010\n                    <jats:sup>\u22123<\/jats:sup>\n                    \/\u22128.5\u00a0\u00d7\u00a010\n                    <jats:sup>\u22123<\/jats:sup>\n                    , and maximum external quantum efficiencies of 37.3% and 36.6%, respectively.\n                  <\/jats:p>","DOI":"10.1002\/adma.202511560","type":"journal-article","created":{"date-parts":[[2025,9,10]],"date-time":"2025-09-10T12:22:24Z","timestamp":1757506944000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Pure\u2010Green Circularly Polarized Multiple Resonance Thermally Activated Delayed Fluorescence Enantiomers with Discontinuous Fused Benzene Rings"],"prefix":"10.1002","volume":"38","author":[{"given":"Linjie","family":"Li","sequence":"first","affiliation":[{"name":"State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University  Changchun 130012 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yincai","family":"Xu","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biomolecular Engineering National University of Singapore  Singapore 117585 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuhan","family":"Sun","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University  Changchun 130012 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yupei","family":"Qu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University  Changchun 130012 P. R. 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