Study of aggregation induced emission of cyano-substituted oligo (p-phenylenevinylene) by femtosecond time resolved fluorescence |
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| Authors: | Yan Zi-Qi Yang Zhi-Yong Wang Hai Li Ai-Wu Wang Li-Ping Yang Han Gao Bing-Rong |
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| Affiliation: | a State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China;b 1st Hospital Attached to Jilin University, Jilin University, 1 Xinmin Street, Changchun 130012, China;c College of Physics, Jilin University, 119 Jiefang Road, Changchun 130023, China |
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| Abstract: | The aggregation induced emission (AIE) mechanism of the cyano-substituted oligo (p-phenylenevinylene)1,4-bis [1-cyano-2-(4-(diphenylamino) phenyl) vinyl] benzene (TPCNDSB) is investigated by time resolved fluorescence technique. By reconstructing the time resolved emission spectra (TRES), it is found that in solvent of low polarity, the emission is mainly from the local emission (LE) state with high quantum yield, but in high polarity solvent, the emission is mainly from the intramolecular charge transfer (ICT) state, which is a relatively dark state, with low quantum yield. In crystal form, the restriction of transfer from LE state to ICT state results in efficient AIE. |
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| Keywords: | Aggregation induced emission Fluorescence up-conversion Intramolecular charge transfer state Local excited state |
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