White organic light-emitting devices using a phosphorescent sensitizer

Cheng, Gang; Li, Feng; Duan, Yu; Feng, Jing; Liu, Shiyong; Qiu, Song; Lin, Dong; Ma, Yuguang; Lee, S. T.
June 2003
Applied Physics Letters;6/16/2003, Vol. 82 Issue 24, p4224
Academic Journal
The efficiency of white organic light-emitting devices has been improved dramatically by the introduction of a phosphorescent material, fac tris (2-phenylpyridine) iridium [Ir(ppy)[sub3]] as a sensitizer. Ir(ppy)[SUB3] and 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl) are codoped into 4,4]-N,N'-dicarbazole-biphenyl (CBP) host. The chromaticity of white emission can (be tuned by adjusting the thickness of the codoped CBP layer or the concentration of Ir(ppy)[SUB3]. The luminance efficiency of these devices is affected at the same time due to the severe difference in efficiency between the two primary emission peaks.


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