ICCAS OpenIR
Red-Emitting Polyfluorenes Grafted with Quinoline-Based Iridium Complex: "Simple Polymeric Chain, Unexpected High Efficiency"
Ma, Zhihua1,2; Ding, Junqiao1; Zhang, Baohua1,2; Mei, Chongyu1; Cheng, Yanxiang1; Xie, Zhiyuan1; Wang, Lixiang1; Jing, Xiabin1; Wang, Fosong1
2010-01-08
Source PublicationADVANCED FUNCTIONAL MATERIALS
ISSN1616-301X
Volume20Issue:1Pages:138-146
AbstractA series of red-light emitting electrophosphorescent polyfluorenes (PFs) with varying content of a quinoline-based iridium complex, (PPQ)(2)Ir(acac) (bis(2,4-diphenylquinolyl-N,C(2')) iridium(acetylacetonate)), in the side chain are synthesized by Suzuki polycondensation. Because of the efficient Forster energy transfer from the PF main chain to (PPQ)(2)Ir(acac) and direct charge trapping on the complex, the electroluminescent emission from PF is nearly completely quenched, even though the amount of iridium complex I incorporated into the polymers is as low as 1 mol %. Based on a single-layer device configuration, a luminous efficiency of up to 5.0 cd A(-1) with a luminance of 2000 cd m(-2) and Commission Internationale de L'Eclairage coordinates of (0.63, 0.35) (x, y) is realized, which is far superior to that of previously reported red-light emitting PFs containing benzothiazole- and isoquinoline-based iridium complexes. This result is beyond expectations, especially when considering that the simple polymeric chain involved has no additional charge-transporting moieties. Noticeably, the device efficiency remains as high as 4.2 cd A(-1) with a luminance of 4000 cd m(-2) even at current densities of 100 mA cm(-2). Further optimization of the device configuration by incorporating an additional electron-injection layer leads to improved efficiencies of 8.3 and 7.5 cd A(-1) at luminances of 100 and 1000 cd m(-2), respectively. This state-of-the-art performance indicates that covalently attaching quinoline-based iridium complexes to a PF backbone is a simple and effective strategy to develop high-efficiency red-light emitting electrophosphorescent polymers.
DOI10.1002/adfm.200901595
Indexed BySCI
Language英语
WOS IDWOS:000274044900016
PublisherWILEY-V C H VERLAG GMBH
Citation statistics
Cited Times:52[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/69904
Collection中国科学院化学研究所
Corresponding AuthorMa, Zhihua
Affiliation1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Ma, Zhihua,Ding, Junqiao,Zhang, Baohua,et al. Red-Emitting Polyfluorenes Grafted with Quinoline-Based Iridium Complex: "Simple Polymeric Chain, Unexpected High Efficiency"[J]. ADVANCED FUNCTIONAL MATERIALS,2010,20(1):138-146.
APA Ma, Zhihua.,Ding, Junqiao.,Zhang, Baohua.,Mei, Chongyu.,Cheng, Yanxiang.,...&Wang, Fosong.(2010).Red-Emitting Polyfluorenes Grafted with Quinoline-Based Iridium Complex: "Simple Polymeric Chain, Unexpected High Efficiency".ADVANCED FUNCTIONAL MATERIALS,20(1),138-146.
MLA Ma, Zhihua,et al."Red-Emitting Polyfluorenes Grafted with Quinoline-Based Iridium Complex: "Simple Polymeric Chain, Unexpected High Efficiency"".ADVANCED FUNCTIONAL MATERIALS 20.1(2010):138-146.
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