{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T03:54:36Z","timestamp":1792727676838,"version":"4.5.0"},"reference-count":54,"publisher":"Wiley","issue":"23","license":[{"start":{"date-parts":[[2026,2,18]],"date-time":"2026-02-18T00:00:00Z","timestamp":1771372800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,2,18]],"date-time":"2026-02-18T00:00:00Z","timestamp":1771372800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Small"],"published-print":{"date-parts":[[2026,4]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    The pursuit of highly efficient non\u2010doped organic light\u2010emitting diodes (OLEDs) has promoted the development of blue emitters with a design strategy. In this study, we developed a deep blue emitter featuring hybridized local and charge\u2010transfer characteristics. The blue emitter, PIMAnCz, consists of a molecular framework of a disrupted phenanthroimidazole moiety, which resulted in large steric hindrance and reduced electron delocalization along the fragments. These features lead to a high spin\u2010orbit coupling between the high\u2010lying triplet level and low\u2010lying singlet level (S\n                    <jats:sub>1<\/jats:sub>\n                    ) and a photoluminescence of 59%. More importantly, the non\u2010doped device employing a neat PIMAnCz emitting layer delivered a maximum external quantum efficiency of 13.19% with Commission Internationale de l'Eclairage (CIE) coordinates of (0.15, 0.09), placing it among the highest efficiencies attained for a non\u2010doped deep blue OLED with CIE\n                    <jats:sub>y<\/jats:sub>\n                    &lt; 0.10. These findings provide practical design insights for a highly efficient blue emitter for non\u2010doped deep blue OLED applications.\n                  <\/jats:p>","DOI":"10.1002\/smll.202502777","type":"journal-article","created":{"date-parts":[[2026,2,18]],"date-time":"2026-02-18T19:14:56Z","timestamp":1771442096000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Designing a Deep Blue Emitter by Disrupting Phenanthroimidazole Conjugation for Non\u2010Doped OLEDs with an External Quantum Efficiency &gt; 13%"],"prefix":"10.1002","volume":"22","author":[{"given":"Mingke","family":"Li","sequence":"first","affiliation":[{"name":"Institute of Polymer Optoelectronic Materials and Devices Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials State Key Laboratory of Luminescent Materials and Devices South China University of Technology  Guangzhou P. R. 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