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They also showed remarkably high photoluminescence quantum yields of 99% and 93%, along with short excited\u2010state lifetimes of 2.72 \u00b5s and 2.34 \u00b5s in poly(methyl methacrylate (PMMA) films, respectively. Deep\u2010blue OLED device using PtTJ\u2010Ph as emitter exhibited narrowband emission spectrum peaking at 458\u00a0nm with a small FWHM value of 25\u00a0nm, resulting in a small Commission Internationale de l'\u00c9clairage (CIE) y coordinate of 0.138. The device also achieved a maximum external quantum efficiency (EQE) of 22.7%, and maintained an EQE of 20.8% at 1000\u00a0cd\/m\n                    <jats:sup>2<\/jats:sup>\n                    with a low efficiency roll\u2010off of only 8.3%, demonstrating excellent electroluminescent properties for deep\u2010blue OLED application.\n                  <\/jats:p>","DOI":"10.1002\/chem.202502048","type":"journal-article","created":{"date-parts":[[2025,10,15]],"date-time":"2025-10-15T06:44:55Z","timestamp":1760510695000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Narrowband Tetradentate Pt(II) Complexes\u2010Based Deep\u2010Blue OLEDs with Low Efficiency Roll\u2010Off"],"prefix":"10.1002","volume":"31","author":[{"given":"Jieying","family":"Tong","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. 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