Zisheng Su et al 2008 J. Phys. D: Appl. Phys. 41 085103 doi:10.1088/0022-3727/41/8/085103
Zisheng Su1,2, Wenlian Li1,3, Bei Chu1, Maoliang Xu1, Guangbo Che1, Dan Wang1,2, Liangliang Han1,2, Xiao Li1,2, Dongyu Zhang1,2, Defeng Bi1 and Yiren Chen1
Show affiliationsEfficient double emission-layer white organic light-emitting diodes comprising a yellow emission from bis[(4,6-difluorophenyl)-pyridinato-N,C2](picolinato)Ir(III) (FIrpic) sensitized [Cu(bis[2-(diphenylphosphino)phenyl]ether) (6,7-Dicyanodipyrido[2,2-d : 2', 3'-f] quinoxaline)]BF4(CuI complex) and a blue emission from 4, 4'-bis(2,2'-diphenylvinyl)-1, 1'-biphenyl (DPVBi) were demonstrated. The emission spectrum can be fine tuned by effectively controlling the thicknesses of the two emission layers. The optimized device with 18 nm FIrpic and the CuI complex codoped 4, 4'-N,N'-dicarbazole-biphenyl layer and 12 nm DPVBi layer shows a maximum current efficiency of 8.5 cd A−1, a maximum power efficiency of 5.3 lm W−1 and a maximum luminance of 3290 cd m−2. Moreover, the device exhibits a CIE coordinate of (0.345, 0.357) at a bias of 8 V and a slight colour variation with increased voltage from 6 to 16 V.
Issue 8 (21 April 2008)
Received 8 December 2007, in final form 30 January 2008
Published 14 March 2008
Zisheng Su et al 2008 J. Phys. D: Appl. Phys. 41 085103
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P J Allisy-Roberts et al 2005 Metrologia 42 06006
Marco Taoso et al JCAP03(2008)022
Robert V. Harlander and Kemal J. Ozeren JHEP11(2009)088
B Holdom 2008 New J. Phys. 10 053040
Tomas Hällgren et al JHEP02(2005)049