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However, conventional single\u2010sensitizer systems are frequently limited by slow exciton utilization and thus severe efficiency roll\u2010off. This study develops a multi\u2010sensitization strategy through the integrated design of a novel sensitizing host and parallel energy\u2010transfer pathways to accelerate exciton utilization. The novel D\u2010\n                    <jats:italic>meta<\/jats:italic>\n                    \u2010\u03c0\u2010A host exhibits a reverse intersystem crossing rate of 3.18 \u00d7 10\n                    <jats:sup>6<\/jats:sup>\n                    s\n                    <jats:sup>\u22121<\/jats:sup>\n                    and a radiative decay rate of 1.94 \u00d7 10\n                    <jats:sup>7<\/jats:sup>\n                    s\n                    <jats:sup>\u22121<\/jats:sup>\n                    , together with balanced charge transport and blue\u2010shifted photoluminescence in the neat film. Its photophysical behavior is consistent with contributions from both intra\u2010 and intermolecular charge\u2010transfer (CT) states. The optimized device demonstrates remarkable electroluminescence performance with a maximum external quantum efficiency (EQE) of 37.1%, a record\u2010high EQE of 32.4% at 5,000\u00a0cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , a turn\u2010on voltage (at 1\u00a0cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    ) of 2.4\u00a0V, and a maximum power efficiency (PE) of 58.0\u00a0lm W\n                    <jats:sup>\u22121<\/jats:sup>\n                    , exhibiting deep\u2010blue emission, ultra\u2010low power consumption, and suppressed efficiency roll\u2010off. This work provides a viable design paradigm for high\u2010performance MR\u2010OLEDs through synergistic exciton management and sensitizer engineering.\n                  <\/jats:p>","DOI":"10.1002\/anie.5503839","type":"journal-article","created":{"date-parts":[[2026,10,22]],"date-time":"2026-10-22T03:53:09Z","timestamp":1792641189000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["High\u2010Efficiency Deep\u2010Blue Narrowband Electroluminescence via Multi\u2010Sensitization Using a D\u2010\n                    <i>meta<\/i>\n                    \u2010\u03c0\u2010A Sensitizing Host"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2627-1111","authenticated-orcid":false,"given":"Qi","family":"Wang","sequence":"first","affiliation":[{"name":"Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry Tsinghua University  Beijing 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