title: Time-resolved fluorescence study of aggregation-induced emission enhancement by restriction of intramolecular charge transfer state.
abstract: Cyano-substituted oligo (alpha-phenylenevinylene)-1,4-bis(R-cyano-4-diphenylaminostyryl)-2,5-diphenylbenzene (CNDPASDB) molecules are studied in solution and aggregate state by time-resolved fluorescence techniques. CNDPASDB exhibits a strong solvent polarity dependent characteristic of aggregation-induced emission (AIE). By time-dependent spectra, the gradual transition from local excited state to intramolecular charge transfer state with the increasing solvent polarity is clearly resolved. The transition time in high polarity solvent DMF is very fast, around 0.5 ps, resulting in a low fluorescence quantum yield. While in aggregate state, the intramolecular torsion is restricted and the local environment becomes less polar. Thus, the intramolecular charge transfer state is eliminated and efficient AIE occurs.
authors.affiliation: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China.
authors.forename: Bing-Rong
authors.initials: BR
authors.lastname: Gao
authors.forename: Hai-Yu
authors.initials: HY
authors.lastname: Wang
authors.forename: Ya-Wei
authors.initials: YW
authors.lastname: Hao
authors.forename: Li-Min
authors.initials: LM
authors.lastname: Fu
authors.forename: Hong-Hua
authors.initials: HH
authors.lastname: Fang
authors.forename: Ying
authors.initials: Y
authors.lastname: Jiang
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Qi-Dai
authors.initials: QD
authors.lastname: Chen
authors.forename: Hong
authors.initials: H
authors.lastname: Xia
authors.forename: Ling-Yun
authors.initials: LY
authors.lastname: Pan
authors.forename: Yu-Guang
authors.initials: YG
authors.lastname: Ma
authors.forename: Hong-Bo
authors.initials: HB
authors.lastname: Sun