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However, solution\u2010processable deep\u2010blue OLEDs that simultaneously have high efficiencies and satisfy the BT.2020 standard remain still a great challenge. To address this issue, here a tetraboron multiresonance thermally activated delayed fluorescence (MR\u2010TADF) emitter, tBO\u20104B, embedded with two soluble 2,12\u2010di\u2010tert\u2010butyl\u20105,9\u2010dioxa\u201013b\u2010boranaphtho[3,2,1\u2010de]anthracene groups is designed and synthesized with a linearly fully fused acceptor\u2013donor\u2013acceptor\u2010type molecular structure. tBO\u20104B not only achieves an ultranarrow full width at half maximum of 12\u00a0nm but also has a negligibly small singlet\u2010triplet energy gap and large spin\u2012orbit coupling, eventually leading to very fast reverse intersystem crossing rate (4.23 \u00d7 10<jats:sup>6<\/jats:sup> s<jats:sup>\u22121<\/jats:sup>). The sensitizer\u2010free solution\u2010processed OLED exploiting tBO\u20104B as the emitter achieves an ultrahigh maximum external quantum efficiency (EQE<jats:sub>max<\/jats:sub>) of 30.3%, with Commission Internationale de l\u2019\u00c9clairage (CIE) coordinates of (0.147, 0.042) meeting the BT.2020 blue standard. In addition, the corresponding sensitizer\u2010free vacuum\u2010processed deep\u2010blue devices also exhibit an impressive EQE<jats:sub>max<\/jats:sub> of 39.6% and mild efficiency roll\u2010off with CIE coordinates of (0.147, 0.043). This work will facilitate the development of high\u2010efficiency ultrapure deep\u2010blue MR\u2010TADF materials for solution\u2010 and vacuum\u2010processed OLEDs.<\/jats:p>","DOI":"10.1002\/adma.202500010","type":"journal-article","created":{"date-parts":[[2025,5,30]],"date-time":"2025-05-30T05:01:18Z","timestamp":1748581278000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":51,"title":["High\u2010Efficiency and High Color Purity Solution\u2010Processable Deep\u2010Blue OLEDs Enabled by Linearly Fully Fused Acceptor\u2010Donor\u2010Acceptor Molecular Design"],"prefix":"10.1002","volume":"37","author":[{"given":"Ying\u2010Chun","family":"Cheng","sequence":"first","affiliation":[{"name":"Institute of Functional Nano &amp; Soft Materials (FUNSOM) Soochow University  Suzhou Jiangsu 215123 P. R. 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiao\u2010Chun","family":"Fan","sequence":"additional","affiliation":[{"name":"Institute of Functional Nano &amp; Soft Materials (FUNSOM) Soochow University  Suzhou Jiangsu 215123 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jia","family":"Yu","sequence":"additional","affiliation":[{"name":"Institute of Functional Nano &amp; Soft Materials (FUNSOM) Soochow University  Suzhou Jiangsu 215123 P. R. China"},{"name":"Jiangsu Key Laboratory of Advanced Negative Carbon Technology Soochow University  Suzhou Jiangsu 215123 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kai","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute of Functional Nano &amp; Soft Materials (FUNSOM) Soochow University  Suzhou Jiangsu 215123 P. R. 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