Novel host material for highly efficient blue phosphorescent OLEDs

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

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Author(s)

  • Ping-I Shih
  • Chen-Han Chien
  • Chu-Ying Chuang
  • Ching-Fong Shu
  • Cheng-Han Yang
  • Jian-Hong Chen

Detail(s)

Original languageEnglish
Pages (from-to)1692-1698
Journal / PublicationJournal of Materials Chemistry
Volume17
Issue number17
Online published2 Feb 2007
Publication statusPublished - 2007
Externally publishedYes

Abstract

We report the synthesis and characterization of a novel silane-fluorene hybrid, triphenyl-(4-(9-phenyl-9H-fluoren-9-yl)phenyl)silane (TPSi-F), used as the host material for blue phosphorescent devices. TPSi-F is constructed by linking p-substituted tetraphenylsilane to the fluorene framework through a non-conjugated, sp3-hybridized carbon atom (C-9) to enhance thermal and morphological stabilities, while maintaining the much needed higher singlet and triplet energy gap. Highly efficient sky-blue phosphorescent OLEDs were obtained when employing TPSi-F as the host and iridium(iii) bis[(4,6- difluorophenyl)pyridinato-N,C2′] (FIrpic) as the guest. The maximum external quantum efficiency (max. E.Q.E.) of this device reached as high as 15% (30.6 cd A-1). Furthermore, upon switching the guest from FIrpic to a new blue phosphor FIrfpy, better blue-emitting OLEDs were produced with a max. E.Q.E. of 9.4% (15.1 cd A-1). These TPSi-F based blue phosphorescent devices show a 2-fold enhancement in device efficiency compared with reference devices based on the conventional host material 1,3-bis(9-carbazolyl)benzene (mCP).

Citation Format(s)

Novel host material for highly efficient blue phosphorescent OLEDs. / Shih, Ping-I; Chien, Chen-Han; Chuang, Chu-Ying; Shu, Ching-Fong; Yang, Cheng-Han; Chen, Jian-Hong; Chi, Yun.

In: Journal of Materials Chemistry, Vol. 17, No. 17, 2007, p. 1692-1698.

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