Peripheral engineering of Ir(iii) emitters with imidazo[4,5-b]pyrazin-2-ylidene cyclometalates for blue organic light emitting diodes

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • I-Che Peng
  • Yi Pan
  • Shek-Man Yiu
  • Ken-Tsung Wong
  • Wen-Yi Hung

Detail(s)

Original languageEnglish
Pages (from-to)12270-12279
Journal / PublicationJournal of Materials Chemistry C
Volume11
Issue number36
Online published8 Aug 2023
Publication statusPublished - 28 Sept 2023

Link(s)

Abstract

Ir(iii) based carbene complexes are highly sought after in the field of organic light-emitting diodes (OLEDs), as they are expected to solve the thorny issue of efficient and durable blue phosphors. Hence, three tris-bidentate Ir(iii) based carbene complexes, namely, f-ct4a-c, were synthesized and fully characterized by both spectroscopic and structural methods, presenting a bulky 2,6-dimethylphenyl substituent on the imidazo[4,5-b]pyrazin-2-ylidene fragment, and a distinctive N-aryl (i.e., either phenyl or 4-t-butylphenyl) appendage and cyclometalating group. These complexes exhibited sky-blue emission with a peak max. located between 473 and 482 nm and a photoluminescent quantum yield (PLQY) of 50-68% recorded in degassed toluene, and furthermore, a much-improved PLQY of 71-87% upon doping in the 2,8-bis(diphenylphosphoryl)-dibenzo[b,d]thiophene (PPT) host matrix. Remarkably, the f-ct4b based OLED device and respective hyper-OLED device exhibited blue Commission Internationale de L’Eclairage CIEx,y coordinates of (0.19,0.47) and (0.11,0.44), and max. external quantum efficiencies (EQEs) of 17.4% and 21.5%, respectively, demonstrating their potential in future OLED applications. © 2023 The Royal Society of Chemistry

Research Area(s)

Citation Format(s)

Peripheral engineering of Ir(iii) emitters with imidazo[4,5-b]pyrazin-2-ylidene cyclometalates for blue organic light emitting diodes. / Yan, Jie; Wu, Yixin; Peng, I-Che et al.
In: Journal of Materials Chemistry C, Vol. 11, No. 36, 28.09.2023, p. 12270-12279.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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