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Recombination region improvement for reduced efficiency roll-off in phosphorescent OLEDs with dual emissive layers
Ma, Zhu1; Zhou, Shunliang1; Hu, Song2; Yu, Junsheng1; Yu, J. (jsyu@uestc.edu.cn)
Source PublicationJournal of Luminescence
Volume154Pages:376-380
2014
Language英语
ISSN00222313
DOI10.1016/j.jlumin.2014.04.042
Indexed BySCI ; Ei
WOS IDWOS:000340687600060
Subtype期刊论文
AbstractHigh-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.; 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.
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ioe.ac.cn/handle/181551/7307
Collection微电子装备总体研究室(四室)
Corresponding AuthorYu, J. (jsyu@uestc.edu.cn)
Affiliation1. 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
GB/T 7714
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.
APA Ma, Zhu,Zhou, Shunliang,Hu, Song,Yu, Junsheng,&Yu, J. .(2014).Recombination region improvement for reduced efficiency roll-off in phosphorescent OLEDs with dual emissive layers.Journal of Luminescence,154,376-380.
MLA Ma, Zhu,et al."Recombination region improvement for reduced efficiency roll-off in phosphorescent OLEDs with dual emissive layers".Journal of Luminescence 154(2014):376-380.
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