Distinct electroluminescent properties of triphenylamine derivatives in blue organic light-emitting devices

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

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Author(s)

  • Shiu-Lun Lai
  • Qing-Xiao Tong
  • Mei-Yee Chan
  • Tsz-Wai Ng
  • Ming-Fai Lo
  • Shuit-Tong Lee

Detail(s)

Original languageEnglish
Pages (from-to)1206-1211
Journal / PublicationJournal of Materials Chemistry
Volume21
Issue number4
Publication statusPublished - 28 Jan 2011

Abstract

Two highly fluorescent triphenylamines (TPA) end-capped respectively with one and three pyrene arms, namely N,N-diphenyl-4-(pyren-1-yl)aniline (PyTPA) and 4,4′,4′′-trispyrenylphenylamine (TPyPA), have been designed, synthesized and applied as hole-transporting emitters in organic light-emitting devices (OLEDs). While the two compounds have similar chemical structures (the only difference being the number of pyrene arms), devices based on them show distinct electroluminescent characteristics. PyTPA-based devices exhibit intense deep-blue emission with Commission Internationale de L'Eclairage coordinates (CIE) of (0.14, 0.11); whilst TPyPA-based devices emit white light with CIE of (0.31, 0.35). It is considered that the three electron-donating pyrene arms in TPyPA increase its electron-donating ability, which facilitates exciplex formation with the electron-transporter. This gives rise to a yellow exciplex emission and thus shifts the electroluminescence from deep-blue to white. More importantly, both devices can operate at record-low driving voltages (-2), indicating the TPA-cored emitters offer not only high luminance efficiencies, but also good hole-injection and transporting features. © 2011 The Royal Society of Chemistry.

Citation Format(s)

Distinct electroluminescent properties of triphenylamine derivatives in blue organic light-emitting devices. / Lai, Shiu-Lun; Tong, Qing-Xiao; Chan, Mei-Yee; Ng, Tsz-Wai; Lo, Ming-Fai; Lee, Shuit-Tong; Lee, Chun-Sing.

In: Journal of Materials Chemistry, Vol. 21, No. 4, 28.01.2011, p. 1206-1211.

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