| 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 Publication | Journal of Luminescence
 |
| Volume | 154Pages:376-380 |
| 2014 | |
| Language | 英语 |
| ISSN | 00222313 |
| DOI | 10.1016/j.jlumin.2014.04.042 |
| Indexed By | SCI ; Ei |
| WOS ID | WOS:000340687600060 |
| Subtype | 期刊论文 |
| Abstract | 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.; 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. |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.ioe.ac.cn/handle/181551/7307 |
| Collection | 微电子装备总体研究室（四室） |
| Corresponding Author | Yu, J. (jsyu@uestc.edu.cn) |
| Affiliation | 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 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. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| 2014-2183.pdf（956KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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