Origin of efficiency roll-off for FIrpic based blue organic light-emitting diodes and implications on phosphorescent molecule design

	Origin of efficiency roll-off for FIrpic based blue organic light-emitting diodes and implications on phosphorescent molecule design
	Wang, J.; H. Zhang; W. Y. Ji; H. Z. Zhang and F. R. Zhu
	2015
发表期刊	Japanese Journal of Applied Physics
卷号	54 期号:10 页码:5
摘要	This work reports our effort on understanding the efficiency roll-off in blue phosphorescent organic light-emitting diodes (OLEDs), based on bis[3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)]-iridium (FIrpic) doped in 4,4-N, N-dicarbazole-biphenyl (CBP) host. The performance of a set of blue phosphorescent OLEDs with different FIrpic dopant concentrations was analyzed. Unusually, the device having a 30-nm-thick pure FIrpic emissive layer with a high luminous efficiency of 7.76 cd/A at 100mA/cm(2) was obtained. Theoretical calculation, based on the density functional theory, reveals that the exciton self-quenching process is suppressed due to the strong Coulomb repulsion between FIrpic molecules. It is found that the efficiency roll-off in FIrpic-based OLEDs is closely related to the exciton quenching induced by the CBP+ radical cations that are present in the CBP host. (c) 2015 The Japan Society of Applied Physics
收录类别	SCI ; EI
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/55464
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Wang, J.,H. Zhang,W. Y. Ji,et al. Origin of efficiency roll-off for FIrpic based blue organic light-emitting diodes and implications on phosphorescent molecule design[J]. Japanese Journal of Applied Physics,2015,54(10):5.
APA	Wang, J.,H. Zhang,W. Y. Ji,&H. Z. Zhang and F. R. Zhu.(2015).Origin of efficiency roll-off for FIrpic based blue organic light-emitting diodes and implications on phosphorescent molecule design.Japanese Journal of Applied Physics,54(10),5.
MLA	Wang, J.,et al."Origin of efficiency roll-off for FIrpic based blue organic light-emitting diodes and implications on phosphorescent molecule design".Japanese Journal of Applied Physics 54.10(2015):5.

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