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A key limitation arises from the difficulty of reconciling narrow emission with efficient harvesting of both singlet and triplet excitons. Here, we introduce a color\u2010fidelity stepwise charge\u2010transfer modulation strategy sequentially strengthens short\u2010range and long\u2010range charge\u2010transfer pathways, suppresses vibrational coupling to narrow the emission spectrum, and simultaneously reduces the singlet\u2013triplet energy gap while enhancing spin\u2013orbit interactions to accelerate the spin\u2010flip process. Guided by this design principle, the optimized emitter (\n                    <jats:bold>BOCz\u2010CzPO<\/jats:bold>\n                    ) achieves a markedly increased reverse intersystem crossing rate (12.5 \u00d7 10\n                    <jats:sup>3<\/jats:sup>\n                    s\n                    <jats:sup>\u22121<\/jats:sup>\n                    ) and a near unity photoluminescence quantum yield. When incorporated into organic light\u2010emitting diodes,\n                    <jats:bold>BOCz\u2010CzPO<\/jats:bold>\n                    delivers one of the highest external quantum efficiencies (28.0%) among deep\u2010blue OLEDs based on mono\u2010boron MR frameworks with CIE\n                    <jats:italic>\n                      <jats:sub>y<\/jats:sub>\n                    <\/jats:italic>\n                    values close to the BT.2020 target, exhibiting Commission Internationale de l\u2019\u00c9clairage chromaticity coordinates of (0.146, 0.052) and approaching the BT.2020 deep\u2010blue specification.\n                  <\/jats:p>","DOI":"10.1002\/anie.8746575","type":"journal-article","created":{"date-parts":[[2026,3,8]],"date-time":"2026-03-08T16:11:47Z","timestamp":1772986307000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Color\u2010Fidelity Stepwise Charge\u2010Transfer Modulation Enables Highly Efficient BT.2020\u2010Compliant Deep\u2010Blue OLEDs"],"prefix":"10.1002","volume":"65","author":[{"given":"Longjiang","family":"Xing","sequence":"first","affiliation":[{"name":"School of Chemical Engineering and Light Industry Guangdong University of Technology  Guangzhou Guangdong Province P.R. 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