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In this work, we introduce DBSeBN, the first MR\u2010TADF emitter incorporating a rigid five\u2010membered dibenzoselenophene unit. This design simultaneously achieves a narrow full width at half maximum of 23\u00a0nm across a wide range of doping concentrations in films, along with an ultra\u2010fast RISC rate of 1.1\u00a0\u00d7\u00a010\n                    <jats:sup>7<\/jats:sup>\n                    \u00a0s\n                    <jats:sup>\u22121<\/jats:sup>\n                    , which is two orders higher than that of its sulfur\u2010containing counterpart, DBTBN, due to the enhanced spin\u2010orbit coupling via the heavy atom effect of selenium. As an OLED emitter, DBSeBN demonstrates exceptional performance, achieving a maximum external quantum efficiency of 31.6% and retaining 23.3% at 1000\u00a0cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , surpassing DBTBN in suppressing efficiency roll\u2010off. Its remarkably fast RISC and insensitivity to doping concentration enable unprecedented versatility in advanced OLED architectures. As a sensitizer in sensitized green\u2010fluorescent OLEDs, it surpasses Ir\u2010based complex sensitizers in reducing efficiency roll\u2010off. As a blue emitter in bi\u2010color white OLEDs, it effectively harnesses high\u2010energy triplet excitons to minimize efficiency roll\u2010off. DBSeBN thus expands the scope of MR\u2010TADF materials across various kinds of OLED applications while suppressing efficiency roll\u2010off.\n                  <\/jats:p>","DOI":"10.1002\/anie.202507626","type":"journal-article","created":{"date-parts":[[2025,5,9]],"date-time":"2025-05-09T10:54:56Z","timestamp":1746788096000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Narrow\u2010Band Dibenzoselenophene\u2010Based Emitter with Rapid Triplet Conversion for Versatile OLED Applications with Superior Roll\u2010Off Suppression"],"prefix":"10.1002","volume":"64","author":[{"given":"Zijian","family":"Chen","sequence":"first","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices and Guangdong Basic Research Center of Excellence for Energy &amp; Information Polymer Materials South China University of Technology  Wushan Road 381, Tianhe District Guangzhou Guang\u2010dong Province 510640 P.R. 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