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题名: Accessing the Triplet State in Heavy-Atom-Free Perylene Diimides
作者: Yu, Zhenyi1, 2; Wu, Yishi1; Peng, Qian1; Sun, Chunlin1; Chen, Jianwei1, 2; Yao, Jiannian1, 3, 4; Fu, Hongbing1, 3, 4
关键词: charge transfer ; intersystem crossing ; perylene diimide ; singlet oxygen generation ; triplet excited state
刊名: CHEMISTRY-A EUROPEAN JOURNAL
发表日期: 2016-03-24
卷: 22, 期:14, 页:4717-4722
收录类别: SCI
英文摘要: Previous studies of perylenediimides (PDIs) mostly utilized the lowest singlet excited state S-1. Generation of a triplet excited state (T-1) in PDIs is important for applications ranging from photodynamic therapy to photovoltaics; however, it remains a formidable task. Herein, we developed a heavy-atom-free strategy to prompt the T1S1 intersystem crossing (ISC) by introducing electron-donating aryl (Ar) groups at the head positions of an electron-deficient perylenediimide (PDI) core. We found that the ISC efficiency increases from 8 to 54% and then to 86% by increasing the electron-donating ability of head-substituted aryl groups from phenyl (p-PDI) to methoxyphenyl (MeO-PDI) and then to methylthioxyphenyl (MeS-PDI). By enhancing the intramolecular charge-transfer (ICT) interaction from p-PDI to MeO-PDI, and then to MeS-PDI, singlet oxygen generation via energy-transfer reactions from T-1 of PDIs to O-3(2) was demonstrated with the highest yield of up to 80%. These results provide guidelines for developing new triplet-generating PDIs and related rylene diimides for optoelectronic applications.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35958
Appears in Collections:光化学实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Chem, BNLMS, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
3.Capital Normal Univ, Dept Chem, Beijing Key Lab Opt Mat & Photon Devices, Beijing 100048, Peoples R China
4.Collaborat Innovat Ctr Chem Sci & Engn, Tianjin 300072, Peoples R China
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