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题名:
Recombination region improvement for reduced efficiency roll-off in phosphorescent OLEDs with dual emissive layers
作者: Ma, Zhu1; Zhou, Shunliang1; Hu, Song2; Yu, Junsheng1
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
Citation statistics:
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
2. Chengdu Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, 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.
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