Back to Search Start Over

Time-resolved fluorescence study of aggregation-induced emission enhancement by restriction of intramolecular charge transfer state.

Authors :
Gao BR
Wang HY
Hao YW
Fu LM
Fang HH
Jiang Y
Wang L
Chen QD
Xia H
Pan LY
Ma YG
Sun HB
Source :
The journal of physical chemistry. B [J Phys Chem B] 2010 Jan 14; Vol. 114 (1), pp. 128-34.
Publication Year :
2010

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.

Details

Language :
English
ISSN :
1520-5207
Volume :
114
Issue :
1
Database :
MEDLINE
Journal :
The journal of physical chemistry. B
Publication Type :
Academic Journal
Accession number :
20020711
Full Text :
https://doi.org/10.1021/jp909063d