Achieving efficient violet-blue electroluminescence with CIEy <0.06 and EQE >6% from naphthyl-linked phenanthroimidazole—carbazole hybrid fluorophores

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Yi Yuan
  • Shao-Fei Ni
  • Qing-Xiao Tong
  • Fu-Lung Wong

Detail(s)

Original languageEnglish
Pages (from-to)3599-3608
Journal / PublicationChemical Science
Volume8
Issue number5
Online published20 Feb 2017
Publication statusPublished - 1 May 2017

Link(s)

Abstract

In this work, we revealed a new approach for the development of efficient violet-blue emitting materials featuring a hybrid local and charge transfer (HLCT) excited state through the incorporation of naphthyl group(s) as a weak n-type π spacer in a donor–π–acceptor (D–π–A) system. The resulting materials (TPINCz and TPIBNCz) show improved intramolecular charge transfer properties and highly efficient violet-blue fluorescence. It is demonstrated that the pattern of the π spacers has significant influence on the photophysical properties. The incorporation of a naphthyl/binaphthyl spacer between the donor and acceptor moieties can alleviate the common dilemma that enhancing device performance by increasing the charge transfer excited properties often leads to red-shifted emissions. A device using TPINCz as an emissive dopant shows a violet-blue emission with CIE coordinates of (0.153, 0.059) and a record high EQE of 6.56 ± 0.11% at a brightness of 1000 cd m−2. To the best of our knowledge, this performance is the highest among the reported devices with CIEy ≤0.08. Our study provides a new pathway for the design of high-performance violet-blue emitters with a D–π–A architecture in organic electroluminescence applications.

Research Area(s)

Citation Format(s)

Achieving efficient violet-blue electroluminescence with CIEy <0.06 and EQE >6% from naphthyl-linked phenanthroimidazole—carbazole hybrid fluorophores. / Chen, Wen-Cheng; Yuan, Yi; Ni, Shao-Fei; Tong, Qing-Xiao; Wong, Fu-Lung; Lee, Chun-Sing.

In: Chemical Science, Vol. 8, No. 5, 01.05.2017, p. 3599-3608.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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