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题名: Emission colour-tunable phosphorescent organic light-emitting diodes based on the self-absorption effect and excimer emission
作者: Wang, Jian1;  Zhang, Fujun1;  Liu, Bo2;  Xu, Zheng1;  Zhang, Jian3;  Wang, Yongsheng1
刊名: JOURNAL OF PHYSICS D-APPLIED PHYSICS
发表日期: 2013-01-09
DOI: 10.1088/0022-3727/46/1/015104
卷: 46, 期:1
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Physics, Applied
研究领域[WOS]: Physics
英文摘要: Two kinds of emission colour-tunable phosphorescent organic light-emitting diodes (PhOLEDs) were realized by changing the Ir(III) bis [2-(4,6-difluorophenyl)-pyridinato-N,C-2'] (picolinate) (FIrpic) doping levels in the host polymer poly(9-vinylcarbazole) (PVK) or by adjusting the driving voltage on the devices with neat FIrpic film as the emission layer. The Commission Internationale del'Eclairage (CIE) coordinates of PhOLEDs could be changed from (0.14, 0.37) to (0.29, 0.55) by adjusting the FIrpic doping levels from 0.08 : 1 to 2 : 1 in the host polymer PVK. It is worthwhile to mention that all PhOLEDs with a FIrpic : PVK film as the emission layer show high emission colour stability dependence on the driving voltage. The photoluminescence emission colour tunability of the FIrpic : PVK films was also observed under the same excitation conditions when the FIrpic : PVK doping level was changed, which is very similar to that observed from electroluminescence (EL) emission of PhOLEDs. For devices with a neat FIrpic film as the emission layer, the EL emission colour of the PhOLEDs could be adjusted by the driving voltage. The CIE coordinates of the PhOLEDs could be tuned from (0.31, 0.50) to (0.44, 0.50) along with an increase in driving voltage from 8 to 20 V. The emission colour tunability of the neat FIrpic or FIrpic : PVK films should be attributed to the FIrpic self-absorption effect and the occurrence of a new emission peak at about 530 nm. The emission peak at about 530 nm was proved to be FIrpic excimer emission by investigating this emission intensity dependence on FIrpic doping levels in PVK or photo/electric-excitation density on FIrpic : PVK and neat FIrpic films.
关键词[WOS]: QUANTUM EFFICIENCY ;  ENERGY-TRANSFER ;  THIN-FILMS ;  COMPLEXES ;  DEVICES ;  OLEDS ;  PERFORMANCE ;  TRANSPORT ;  EXCITON ;  LAYERS
语种: 英语
WOS记录号: WOS:000311834400007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/137938
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Beijing Jiaotong Univ, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China
2.Beijing Jiaotong Univ, Sch Sci, Inst Chem, Beijing 100044, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Wang, Jian,Zhang, Fujun,Liu, Bo,et al. Emission colour-tunable phosphorescent organic light-emitting diodes based on the self-absorption effect and excimer emission[J]. JOURNAL OF PHYSICS D-APPLIED PHYSICS,2013,46(1).
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