A hybrid white organic light-emitting diode with stable color and reduced efficiency roll-off by using a bipolar charge carrier switch

doi:10.1016/j.orgel.2012.03.005

CORC > 化学研究所 > 中国科学院化学研究所

	A hybrid white organic light-emitting diode with stable color and reduced efficiency roll-off by using a bipolar charge carrier switch
	Zhao, Fangchao; Zhang, Zhiqiang; Liu, Yipeng; Dai, Yanfeng; Chen, Jiangshan; Ma, Dongge
刊名	ORGANIC ELECTRONICS
	2012-06-01
卷号	13 期号:6 页码:1049-1055
关键词	Hybrid White Organic Light-emitting Diode Charge Carrier Switch Exciton Recombination Zone Color Stability
ISSN号	1566-1199
DOI	10.1016/j.orgel.2012.03.005
英文摘要	A hybrid white organic light-emitting diode (WOLED) with an emission layer (EML) structure composed of red phosphorescent EML/green phosphorescent EML/spacer/blue fluorescent EML was demonstrated. This hybrid WOLED shows high efficiency, stable spectral emission and low efficiency roll-off at high luminance. We have attributed the significant improvement to the wide distribution of excitons and the effective control of charge carriers in EMLs by using mixed 4,4',4 ''-tri(9-carbazoyl) triphenylamine (TCTA) and bis[2-(2-hydroxyphenyl)-pyridine] beryllium (Bepp2) as the host of phosphorescent EMLs as well as the spacer. The bipolar mixed TCTA: Bepp(2), which was proved to be a charge carrier switch by regulating the distribution of charge carriers and then the exciton recombination zone, plays an important role in improving the efficiency, stabilizing the spectrum and reducing the efficiency roll-off at high luminous. The hybrid WOLED exhibits a current efficiency of 30.2 cd/A, a power efficiency of 32.0 lm/W and an external quantum efficiency of 13.4% at a luminance of 100 cd/m(2), and keeps a current efficiency of 30.8 cd/A, a power efficiency of 27.1 lm/W and an external quantum efficiency of 13.7% at a 1000 cd/m(2). The Commission Internationale de l'Eclairage (CIE) coordinates of (0.43, 0.43) and the color rendering index (CRI) of 89 remain nearly unchanged in the whole range of luminance. (C) 2012 Elsevier B.V. All rights reserved.
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000302961200018
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/48447]
专题	中国科学院化学研究所
通讯作者	Ma, Dongge
作者单位	Chinese Acad Sci, Changchun Inst Appl Chem, Grad Univ, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Fangchao,Zhang, Zhiqiang,Liu, Yipeng,et al. A hybrid white organic light-emitting diode with stable color and reduced efficiency roll-off by using a bipolar charge carrier switch[J]. ORGANIC ELECTRONICS,2012,13(6):1049-1055.
APA	Zhao, Fangchao,Zhang, Zhiqiang,Liu, Yipeng,Dai, Yanfeng,Chen, Jiangshan,&Ma, Dongge.(2012).A hybrid white organic light-emitting diode with stable color and reduced efficiency roll-off by using a bipolar charge carrier switch.ORGANIC ELECTRONICS,13(6),1049-1055.
MLA	Zhao, Fangchao,et al."A hybrid white organic light-emitting diode with stable color and reduced efficiency roll-off by using a bipolar charge carrier switch".ORGANIC ELECTRONICS 13.6(2012):1049-1055.