Jun Wang et al 2008 J. Phys. D: Appl. Phys. 41 045104 doi:10.1088/0022-3727/41/4/045104
Jun Wang, Junsheng Yu1, Lu Li, Xiaoqing Tang and Yadong Jiang1
Show affiliationsWhite organic light-emitting devices (OLEDs) were fabricated using phosphorescent material bis[2-(4-tert-butylphenyl)benzothiazolato-N,C2']iridium (acetylacetonate) [(t-bt)2Ir(acac)] doped in 4,4'-bis(carbazol-9-yl) biphenyl (CBP) matrix as a yellow light-emitting layer and a thin layer 4,4'-bis(2,2'-diphenylvinyl)-1,1'-diphenyl (DPVBi) as the blue light-emitting layer. The light colour of the OLEDs can be adjusted by changing doped concentration and the thickness of the DPVBi thin layer. The maximum luminance and power efficiency of 5% doped device reached 15 460 cd m−2 and 8.1 lm W−1, respectively. The 3% doped device showed the CIE coordinates of (0.344, 0.322) at 8 V and a maximum power efficiency of 5.7 lm W−1 at 4.5 V.
85.60.Jb Light-emitting devices
85.60.Bt Optoelectronic device characterization, design, and modeling
Issue 4 (21 February 2008)
Received 25 October 2007, in final form 15 December 2007
Published 28 January 2008
Jun Wang et al 2008 J. Phys. D: Appl. Phys. 41 045104
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