Issue 9, 2007

Ultrafast excited-state dynamics of phenyleneethynylene oligomers in solution

Abstract

The excited-state dynamics of oligomeric phenyleneethynylenes (OPEs) of various length and substitution has been investigated by femtosecond time-resolved spectroscopy. The fluorescence lifetime of the OPEs decreases with the number of phenyleneethynylene units up to about 9. This effect is due to an increase of the oscillator strength for the S1–S0 transition. Dynamic features occurring within a few tens of picoseconds and ascribed to structural relaxation directly after population of the S1 state can be observed in non-viscous solvents. The effect of torsional disorder on the fluorescence intensity is shown to depend strongly on the nature of the substituent on the phenyl groups. All these effects are qualitatively discussed with a simple exciton model.

Graphical abstract: Ultrafast excited-state dynamics of phenyleneethynylene oligomers in solution

Article information

Article type
Paper
Submitted
20 Feb 2007
Accepted
05 Apr 2007
First published
27 Apr 2007

Photochem. Photobiol. Sci., 2007,6, 956-963

Ultrafast excited-state dynamics of phenyleneethynylene oligomers in solution

G. Duvanel, J. Grilj, A. Schuwey, A. Gossauer and E. Vauthey, Photochem. Photobiol. Sci., 2007, 6, 956 DOI: 10.1039/B702647A

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