Modulated emission from dark triplet excitons in aza-acene compounds: fluorescence versus phosphorescence
文献类型：期刊论文
| 作者 | Chen, Jianwei1,2; Chen, Yi3,4; Wu, Yishi1; Wang, Xuedong1,2; Yu, Zhenyi1,2; Xiao, Lu1,2; Liu, Yanping1,2; Tian, He3,4; Yao, Jiannian1; Fu, Hongbing1,5 |
| 刊名 | NEW JOURNAL OF CHEMISTRY
 |
| 出版日期 | 2017 |
| 卷号 | 41期号:4页码:1864-1871 |
| 英文摘要 | In the field of organic light-emitting diodes (OLEDs), research interests focus on making the optically dark triplet excitons shine in order to increase the electro-optic conversion efficiency of devices. In this work, two kinds of phenazine compounds, i.e. dibenzo[ a,c] phenazine (DBP) and tribenzo[ a,c,i] phenazine (TBP), were synthesized and used as model compounds to regulate the emission efficiency of the dark triplet excitons by chemical modification. Charge-transfer induced ultrafast intersystem crossing (CT-ISC) with a time constant of similar to 1 ps was observed for these two phenazine derivatives upon photoexcitation with a high triplet yield of 77.1% for DBP and 58.7% for TBP. The triplet excited states of DBP can produce ultra-long phosphorescence with lifetime as long as 318 ms at 77 K. The quantum yield for phosphorescence (FP) is determined to be 8.45%. In sharp contrast, the triplet-excited (TBP)-T-3* undergoes an efficient reverse intersystem crossing (RISC) process, resulting in bright delayed fluorescence emission with negligible phosphorescence. A controllable luminescence behavior from the triplet states between fluorescence and phosphorescence in phenazine derivatives is demonstrated. Theoretical calculations reveal that the structure-dependent triplet evolution is due to the charge-transfer induced energy level alignment within these compounds. Our results may have potential applications in the design of OLEDs and high triplet yield pure organic materials. |
| 语种 | 英语 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/38121]  |
| 专题 | 化学研究所_光化学实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Chem, BNLMS, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100039, Peoples R China 3.East China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China 4.East China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China 5.Capital Normal Univ, Dept Chem, Beijing 100048, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Jianwei,Chen, Yi,Wu, Yishi,et al. Modulated emission from dark triplet excitons in aza-acene compounds: fluorescence versus phosphorescence[J]. NEW JOURNAL OF CHEMISTRY,2017,41(4):1864-1871. |
| APA | Chen, Jianwei.,Chen, Yi.,Wu, Yishi.,Wang, Xuedong.,Yu, Zhenyi.,...&Fu, Hongbing.(2017).Modulated emission from dark triplet excitons in aza-acene compounds: fluorescence versus phosphorescence.NEW JOURNAL OF CHEMISTRY,41(4),1864-1871. |
| MLA | Chen, Jianwei,et al."Modulated emission from dark triplet excitons in aza-acene compounds: fluorescence versus phosphorescence".NEW JOURNAL OF CHEMISTRY 41.4(2017):1864-1871. |
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来源：化学研究所
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