High-efficiency orange to near-infrared emissions from bis-cyclometalated iridium complexes with phenyl-benzoquinoline isomers as ligands | |
Qiao, Juan ; Duan, Lian ; Tang, Lingtian ; He, Lei ; Wang, Liduo ; Qiu, Yong | |
2010-10-12 ; 2010-10-12 | |
关键词 | LIGHT-EMITTING-DIODES BLUE ORGANIC ELECTROPHOSPHORESCENCE EXCITED-STATE QUANTUM EFFICIENCY METAL-COMPLEXES DEVICES PHOSPHORESCENCE DERIVATIVES MECHANISM DENSITY Chemistry, Physical Materials Science, Multidisciplinary |
中文摘要 | We report the synthesis and characterization of three novel bis-cyclometalated iridium complexes with phenyl-benzoquinoline (pbq) analogs as ligands, namely, Ir(pbq-f)(2)acac, Ir(dpbq-f)(2)acac, and Ir(pbq-g)(2)acac, where pbq-f, dpbq-f and pbq-g representing 3-phenyl-benzo[f]quinoline, 1,3-diphenyl-benzo[f] quinoline, and 2-phenyl-benzo[g] quinoline, respectively. Interesting distinctions were observed in the electronic structures, photophysical and electroluminescent properties of these complexes. Ir(pbq-f)(2)acac and Ir(dpbq-f)(2)acac are orange-red emissive phosphors with strong metal-ligand charge transfer ((MLCT)-M-3) emission bands centered at 577 and 604nm, respectively, while Ir(pbq-g)(2)acac shows the largest red-shift to near-infrared (NIR) region with a peak emission at 708nm and a shoulder around 780nm in solution. All the phosphors exhibit strong electrophosphorescence with negligible triplet-triplet annihilation due to quite short phosphorescent lifetimes (similar to 0.5 mu s) and high emission quantum yields. Orange-red emissive Ir(dpbq-f)(2)acac gives a maximum current efficiency of 17.4 cd/A and external quantum efficiency (eta(ext)) of 10.5%. NIR emissive Ir(pbq-g)(2)acac shows a promising emission centered at 720nm with a shoulder above 780nm. Forward light output is 4.6 mW/cm(2) at 13V and the maximum eta(ext) is nearly 1.1%. Our study demonstrates that the constitutional isomers of cyclometallated ligand distinctly control the electronic structures and emissive properties of the corresponding Ir complexes and the obtained NIR emissive Ir(pbq-g)(2)acac implies the potential to realize highly efficient NIR OLEDs based on Ir(III) complexes. |
语种 | 英语 ; 英语 |
出版者 | ROYAL SOC CHEMISTRY ; CAMBRIDGE ; THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND |
内容类型 | 期刊论文 |
源URL | [http://hdl.handle.net/123456789/80814] |
专题 | 清华大学 |
推荐引用方式 GB/T 7714 | Qiao, Juan,Duan, Lian,Tang, Lingtian,et al. High-efficiency orange to near-infrared emissions from bis-cyclometalated iridium complexes with phenyl-benzoquinoline isomers as ligands[J],2010, 2010. |
APA | Qiao, Juan,Duan, Lian,Tang, Lingtian,He, Lei,Wang, Liduo,&Qiu, Yong.(2010).High-efficiency orange to near-infrared emissions from bis-cyclometalated iridium complexes with phenyl-benzoquinoline isomers as ligands.. |
MLA | Qiao, Juan,et al."High-efficiency orange to near-infrared emissions from bis-cyclometalated iridium complexes with phenyl-benzoquinoline isomers as ligands".(2010). |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论