Novel host material for highly efficient blue phosphorescent OLEDs
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 1692-1698 |
Journal / Publication | Journal of Materials Chemistry |
Volume | 17 |
Issue number | 17 |
Online published | 2 Feb 2007 |
Publication status | Published - 2007 |
Externally published | Yes |
Link(s)
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 et al.
In: Journal of Materials Chemistry, Vol. 17, No. 17, 2007, p. 1692-1698.
In: Journal of Materials Chemistry, Vol. 17, No. 17, 2007, p. 1692-1698.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review