题名: Recombination region improvement for reduced efficiency roll-off in phosphorescent OLEDs with dual emissive layers
作者: Ma, Zhu 1 ; Zhou, Shunliang 1 ; Hu, Song 2 ; Yu, Junsheng 1
刊名: Journal of Luminescence
出版日期: 2014
卷号: 154, 页码: 376-380 学科分类: Efficiency - Excitons - Iridium - Light emission - Light emitting diodes
DOI: 10.1016/j.jlumin.2014.04.042
通讯作者: Yu, J. (jsyu@uestc.edu.cn)
文章类型: 期刊论文
中文摘要: High-performance phosphorescent organic light-emitting diodes (PhOLEDs) by using dual-emissive-layer (DEL) structure to reduce efficiency roll-off were fabricated. The DEL was comprised of a hole-transport-type host of N, N′-bis(naphthalen-1-yl)-N, N′-bis(phenyl)-benzidine (NPB) and a bipolar host of 4,4′-bis(carbazol-9-yl)biphenyl (CBP), which were both doped with an orange phosphorescent dopant of bis[2-(4-tert-butylphenyl)- benzothiazolato-N,C2′]iridium (acetylacetonate) [(t-bt) 2Ir(acac)]. After the optimization of doping concentration of the first emissive layer (FEL), the device with DEL exhibited 11% lower roll-off power efficiency than single emissive layer devices (SED) when the luminance increased from 1000 cd/m2 to 10,000 cd/m2. The hole-electron recombination zone in DEL was illuminated by inserting an ultrathin fluorescent probe of 4-(dicyanomethylene)-2-tert-butyl-6 (1,1,7,7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran (DCJTB) in different emissive regions. The performance improvement was attributed to the optimization of energy barrier and the expansion of exciton formation zone within the DEL. © 2014 Elsevier B.V. 英文摘要: High-performance phosphorescent organic light-emitting diodes (PhOLEDs) by using dual-emissive-layer (DEL) structure to reduce efficiency roll-off were fabricated. The DEL was comprised of a hole-transport-type host of N, N′-bis(naphthalen-1-yl)-N, N′-bis(phenyl)-benzidine (NPB) and a bipolar host of 4,4′-bis(carbazol-9-yl)biphenyl (CBP), which were both doped with an orange phosphorescent dopant of bis[2-(4-tert-butylphenyl)- benzothiazolato-N,C2′]iridium (acetylacetonate) [(t-bt) 2Ir(acac)]. After the optimization of doping concentration of the first emissive layer (FEL), the device with DEL exhibited 11% lower roll-off power efficiency than single emissive layer devices (SED) when the luminance increased from 1000 cd/m2 to 10,000 cd/m2. The hole-electron recombination zone in DEL was illuminated by inserting an ultrathin fluorescent probe of 4-(dicyanomethylene)-2-tert-butyl-6 (1,1,7,7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran (DCJTB) in different emissive regions. The performance improvement was attributed to the optimization of energy barrier and the expansion of exciton formation zone within the DEL. © 2014 Elsevier B.V. 收录类别: SCI
; Ei
项目资助者: National Natural Science Foundation of China (NSFC) [61177032]
; Foundation for Innovative Research Groups of the NSFC [61021061]
; Fundamental Research Funds for the Central Universities [ZYGX2010Z004]
; SRF for ROCS, SEM [GGRYJJ08-05]
; Doctoral Fund of Ministry of Education of China [20090185110020]
语种: 英语
WOS记录号: WOS:000340687600060
ISSN号: 00222313
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内容类型: 期刊论文
URI标识: http://ir.ioe.ac.cn/handle/181551/7307
Appears in Collections: 微电子装备总体研究室（四室）_期刊论文
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作者单位: 1. State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China
Recommended Citation:
Ma, Zhu,Zhou, Shunliang,Hu, Song,et al. Recombination region improvement for reduced efficiency roll-off in phosphorescent OLEDs with dual emissive layers[J]. Journal of Luminescence,2014,154:376-380.
