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Exciton dynamics in a disordered conjugated polymer : Three-pulse photon-echo and transient grating experiments

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2008

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Sperling, Jaroslaw
Nemeth, Alexandra
Šanda, František
Riedle, Eberhard
Kauffmann, Harald Friedrich
Mukamel, Shaul
Milota, Franz

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https://doi.org/10.1016/j.chemphys.2008.02.046
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Chemical Physics. Elsevier. 2008, 349(1-3), pp. 244-249. ISSN 0301-0104. eISSN 1873-4421. Available under: doi: 10.1016/j.chemphys.2008.02.046

Zusammenfassung

We study the sub-picosecond exciton dynamics of the prototypical soluble conjugated polymer poly[2-(2′-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene] (MEH-PPV) by comparative three-pulse photon-echo peak-shift and transient grating measurements, performed under excitation energy tuning conditions. The strong sensitivity of signal decays to the chosen excitation energy is ascribed to the interplay of inter- and intra-segmental relaxation events in an ensemble of electronically coupled sites. As a result, the energetic site-to-site disorder and its contribution to the spectral lineshape is most reliably determined for excitation of the redmost part of the absorption spectrum. Comparing the data for the two solvents toluene and tetrahydrofurane, we conclude a weak sensitivity only to the specific type of solute-solvent interactions. Within our time-resolution, we surprisingly recover weak but reproducible modulations of the third-order signals that are damped out on the early picosecond timescale.

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530 Physik

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Ultrafast spectroscopy, Conjugated polymer, Photon echo

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ISO 690SPERLING, Jaroslaw, Alexandra NEMETH, Peter BAUM, František ŠANDA, Eberhard RIEDLE, Harald Friedrich KAUFFMANN, Shaul MUKAMEL, Franz MILOTA, 2008. Exciton dynamics in a disordered conjugated polymer : Three-pulse photon-echo and transient grating experiments. In: Chemical Physics. Elsevier. 2008, 349(1-3), pp. 244-249. ISSN 0301-0104. eISSN 1873-4421. Available under: doi: 10.1016/j.chemphys.2008.02.046
BibTex
@article{Sperling2008Excit-51905,
  year={2008},
  doi={10.1016/j.chemphys.2008.02.046},
  title={Exciton dynamics in a disordered conjugated polymer : Three-pulse photon-echo and transient grating experiments},
  number={1-3},
  volume={349},
  issn={0301-0104},
  journal={Chemical Physics},
  pages={244--249},
  author={Sperling, Jaroslaw and Nemeth, Alexandra and Baum, Peter and Šanda, František and Riedle, Eberhard and Kauffmann, Harald Friedrich and Mukamel, Shaul and Milota, Franz}
}
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