ICCAS OpenIR
Synthesis and characterization of red light-emitting electrophosphorescent polymers with different triplet energy main chain
Ma, Zhihua1,2; Ding, Junqiao1; Cheng, Yanxiang1; Xie, Zhiyuan1; Wang, Lixiang1; Jing, Xiabin1; Wang, Fosong1
2011-05-04
Source PublicationPOLYMER
ISSN0032-3861
Volume52Issue:10Pages:2189-2197
AbstractRed light-emitting electrophosphorescent polymers with poly(fluorene-alt-carbazole) (PFCz) and poly (3,6-carbazole) (PCz) as the main chain, and the quinoline-based iridium (Ir) complex as the side chain have been synthesized by Suzuki and modified Yamamoto polymerization, respectively. The triplet energy of the polymeric backbone is tuned from 2.1 eV of polyfluorene (PF) to 2.3 eV of PFCz and 2.6 eV of PCz. We find that, with the increasing triplet energy, the lifetime of the triplet excitons gradually increases, but the device efficiency becomes worse. The reason is that the alteration of the main chain structure leads to the increase of the highest occupied molecular orbital (HOMO) level of the polymeric host, which can facilitate the efficient hole injection and transportation. As a consequence of this enhancement of the hole current, charge balance in the emitting layer is destroyed, and correspondingly, the poorer device performance is achieved. Our results, we believe, indicate that besides the triplet energy, charge balance is a crucial determinant to develop high efficiency red light-emitting electrophosphorescent polymers. (C) 2011 Elsevier Ltd. All rights reserved.
KeywordElectrophosphorescent Polymers Light Emitting Diodes Triplet Energy
DOI10.1016/j.polymer.2011.03.023
Indexed BySCI
Language英语
WOS IDWOS:000290131500011
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:21[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/72810
Collection中国科学院化学研究所
Corresponding AuthorDing, Junqiao
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,Cheng, Yanxiang,et al. Synthesis and characterization of red light-emitting electrophosphorescent polymers with different triplet energy main chain[J]. POLYMER,2011,52(10):2189-2197.
APA Ma, Zhihua.,Ding, Junqiao.,Cheng, Yanxiang.,Xie, Zhiyuan.,Wang, Lixiang.,...&Wang, Fosong.(2011).Synthesis and characterization of red light-emitting electrophosphorescent polymers with different triplet energy main chain.POLYMER,52(10),2189-2197.
MLA Ma, Zhihua,et al."Synthesis and characterization of red light-emitting electrophosphorescent polymers with different triplet energy main chain".POLYMER 52.10(2011):2189-2197.
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