Title: Bis(2,2-diphenylvinyl)spirobifluorene: An efficient and stable blue emitter for electroluminescence applications
Authors: Wu, FI
Shu, CF
Wang, TT
Diau, EWG
Chien, CH
Chuen, CH
Tao, Y
應用化學系
Department of Applied Chemistry
Keywords: spirobifluorene;glass transition temperature;blue emission;lifetime;OLED
Issue Date: 15-Aug-2005
Abstract: We have synthesized a spirobifluorene-based DPVBi [4,4'-bis(2,2-diphenylvinyl)-1,1'-biphenyl] analogue, DPVSBF [2,7-bis(2,2diphenylvinyl)-9,9'-spirobifluorene], in which the bis(2,2-diphenylvinyl) groups are connected through the 2 and 7 positions of the spirobifluorene framework, and have characterized its thermal properties, electronic properties (viz. absorption and photoluminescence), and electrochemical behavior. The presence of the rigid spirobifluorene linkage imparts significant improvement in the material's glass transition temperature and morphological stability, while preserving most of the photophysical and electronic properties of its non-spiro, biphenyl analogue, DPVBi. Organic electroluminescent devices having the structure ITO/NPB/DPVSBF/AlQ/LiF/Al display bright emissions with a lambda(max) at 474 nm (CIE coordinates: 0.16, 0.24) and exhibit maximum luminescence exceeding 40,000 cd/m(2). At a driving current density of 100 mAcm(2) (6.4 V), a luminance of 4110 cd/m(2) was obtained with external quantum efficiency of 2.54%, luminance efficiency of 4.1 cd/A, and power efficiency of 2.0 lm/W. Moreover, the DPVSBF-based device exhibits a 16-fold enhancement in the operation lifetime relative to that of a similar device based on DPVBi. (C) 2005 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.synthmet.2005.06.003
http://hdl.handle.net/11536/13400
ISSN: 0379-6779
DOI: 10.1016/j.synthmet.2005.06.003
Journal: SYNTHETIC METALS
Volume: 151
Issue: 3
Begin Page: 285
End Page: 292
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