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In this study, four novel tetradentate Pt(II) emitters (PtCY, PtCY\u2010F, PtCY\u2010\n                    <jats:italic>t<\/jats:italic>\n                    Bu, PtCY\u2010\n                    <jats:italic>t<\/jats:italic>\n                    BuF) are designed through a synergistic strategy of molecular orbital engineering and steric hindrance effect. By introducing a bulky diisopropylbiphenyl (diPrPh) group at the\n                    <jats:italic>N<\/jats:italic>\n                    \u2010heterocyclic carbene (NHC) moiety to increase molecular rigidity and suppress intermolecular interactions, the Pt(II) emitters achieve narrowband deep\u2010blue emission (452\u2013457\u00a0nm) in dichloromethane, with full width at half maximum (FWHM) values of 18\u201323\u00a0nm. Combined with the introduction of fluorine atoms (\u2500F) away from the lowest unoccupied molecular orbital (LUMO) distribution, the external quantum efficiency (EQE) is improved while avoiding the breakage of the C\u2500F bond. PtCY\u2010\n                    <jats:italic>t<\/jats:italic>\n                    BuF\u2010based device B4 achieved a high maximum luminance of 45621\u00a0cd\u00a0m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , and record high EQEs of 27.1%, 24.3%, and 21.7% at high brightness levels of 1000, 5000, and 10\u00a0000\u00a0cd\u00a0m\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>2<\/jats:sup>\n                    respectively and lowest efficiency roll\u2010off of 3.2% at 1000\u00a0cd\u00a0m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , among reported Pt(II)\u2010based deep\u2010blue OLEDs with CIE\n                    <jats:sub>y<\/jats:sub>\n                    &lt; 0.15. This study provides a novel strategy for the development of highly efficient tetradentate Pt(II) emitters with high color purity for high\u2010performance deep\u2010blue PhOLED applications.\n                  <\/jats:p>","DOI":"10.1002\/advs.202509722","type":"journal-article","created":{"date-parts":[[2025,10,3]],"date-time":"2025-10-03T12:59:02Z","timestamp":1759496342000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Dual Regulation of Molecular Rigidity and Orbital Engineering of Pt(II) Emitters for High\u2010Performance Deep\u2010Blue OLEDs"],"prefix":"10.1002","volume":"12","author":[{"given":"Chengyao","family":"Zhang","sequence":"first","affiliation":[{"name":"Center for Phosphorescent Material Research State Key Laboratory of Green Chemical Synthesis and Conversion College of Chemical Engineering Zhejiang University of Technology  Hangzhou Zhejiang 310014 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kewei","family":"Xu","sequence":"additional","affiliation":[{"name":"Center for Phosphorescent Material Research State Key Laboratory of Green Chemical Synthesis and Conversion College of Chemical Engineering Zhejiang University of Technology  Hangzhou Zhejiang 310014 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yun\u2010Fang","family":"Yang","sequence":"additional","affiliation":[{"name":"Center for Phosphorescent Material Research State Key Laboratory of Green Chemical Synthesis and Conversion College of Chemical Engineering Zhejiang University of Technology  Hangzhou Zhejiang 310014 P. R. 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