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Herein, by introducing a donor\u2013acceptor (D\u2013A) skeleton with a phenoxaselenine donor, three nonaromatic amine donor containing compounds with high <jats:italic>\u03d5<\/jats:italic><jats:sub>P<\/jats:sub> and short <jats:italic>\u03c4<\/jats:italic><jats:sub>P<\/jats:sub> in amorphous films are developed. Besides the enhanced spin\u2013orbit coupling (SOC) by the heavy\u2010atom effect of selenium, the D\u2013A skeleton which facilitates orbital angular momentum change can further boost SOC, and severe nonradiative energy dissipation is also suppressed by the rigid molecular structure. Consequently, a record\u2010high external quantum efficiency of 19.5% are achieved for the RTP organic light\u2010emitting diode (OLED) based on 2\u2010(phenoxaselenin\u20103\u2010yl)\u20104,6\u2010diphenyl\u20101,3,5\u2010triazine (PXSeDRZ). Moreover, voltage\u2010dependent color\u2010tunable emission and single\u2010molecule white emission are also realized. These results shed light on the broad prospects of purely organic phosphorescence materials as highly efficient OLED emitters especially for potential charming lighting applications.<\/jats:p>","DOI":"10.1002\/advs.202207003","type":"journal-article","created":{"date-parts":[[2023,2,20]],"date-time":"2023-02-20T03:32:16Z","timestamp":1676863936000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":84,"title":["Highly Efficient Purely Organic Phosphorescence Light\u2010Emitting Diodes Employing a Donor\u2013Acceptor Skeleton with a Phenoxaselenine Donor"],"prefix":"10.1002","volume":"10","author":[{"given":"Zijian","family":"Chen","sequence":"first","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices South China University of Technology  Wushan Road 381, Tianhe District Guangzhou Guangdong Province 510640 P. R. 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