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Here, a synergistic molecular design is reported that combines \u03c0\u2010extension and heavy\u2010atom incorporation to effectively reconcile the trade\u2010off between color purity and fast reverse intersystem crossing (RISC). In this approach, \u03c0\u2010extension narrows the emission bandwidth and reduces the singlet\u2013triplet energy gap, while the strategic introduction of chalcogen atoms selectively enhances spin\u2013orbit coupling with minimal impact on the emission spectrum. As a result, the new emitter exhibits a peak emission at 453\u00a0nm with an exceptionally narrow full width at half maximum (FWHM) of 17\u00a0nm and a high RISC rate constant of 3.0 \u00d7 10\n                    <jats:sup>6<\/jats:sup>\n                    \u2009s\n                    <jats:sup>\u22121<\/jats:sup>\n                    . When incorporated into a non\u2010sensitized OLED, the emitter meets the European Broadcast Union (EBU) deep\u2010blue standard with CIE coordinates as low as (0.140,\u20090.059), and sustains a brightness exceeding 30,000\u2009cd\u2009m\n                    <jats:sup>\u22122<\/jats:sup>\n                    . Notably, the device achieves a record\u2010high external quantum efficiency (EQE\n                    <jats:sub>max<\/jats:sub>\n                    ) of 40.5% with minimal roll\u2010off\u2014retaining 38.4% and 28.2% at 100 and 1,000\u00a0cd\u2009m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , respectively\u2014and attains a Blue Index (BI) of 422\u00a0cd\u2009A\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u2009CIE\n                    <jats:sub>y<\/jats:sub>\n                    <jats:sup>\u22121<\/jats:sup>\n                    . These findings highlight the effectiveness of our tactic in overcoming prior limitations where heavy\u2010atom doping often compromises color purity, paving the way for next\u2010generation emitters in advanced display and lighting applications.\n                  <\/jats:p>","DOI":"10.1002\/adma.202502459","type":"journal-article","created":{"date-parts":[[2025,5,19]],"date-time":"2025-05-19T03:35:24Z","timestamp":1747625724000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":55,"title":["Deep\u2010Blue Narrowband OLEDs Achieve External Quantum Efficiency Over 40% and Blue Index of 422 by Synergistic \u03c0\u2010Extension and Heavy\u2010Atom Effect"],"prefix":"10.1002","volume":"37","author":[{"given":"Hong","family":"Lin","sequence":"first","affiliation":[{"name":"Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University  Shenzhen 518060 P. R. 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