Two-step mechanism for the photoinduced intramolecular electron transfer in oligo(p-phenylene vinylene)-fullerene dyads
The intramolecular photoinduced charge separation within two oligo(p-phenylene vinylene) fulleropyrrolidine dyads with three and four phenyl rings (OPV3-C{sub 60} and OPV4-C{sub 60}) is investigated with femtosecond pump-probe spectroscopy in solvents of different polarity. Photoexcitation of the OPV moiety of these dyads results in an ultrafast singlet-energy transfer reaction to create the fullerene singlet excited state with a time constant of 190 fs, irrespective of the polarity of the medium. In a polar solvent, intramolecular electron transfer occurs from the OPV moiety to the C{sub 60} moiety with a time constant of 10--13 ps as a secondary reaction, subsequent to the ultrafast singlet-energy transfer. The charge-separated state has a lifetime of 50--90 ps and recombines to the ground state.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40230879
- Journal Information:
- Physical Review B, Vol. 64, Issue 7; Other Information: DOI: 10.1103/PhysRevB.64.075206; Othernumber: PRBMDO000064000007075206000001; 077131PRB; PBD: 15 Aug 2001; ISSN 0163-1829
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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