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Tönu Pullerits. Portrait.

Tönu Pullerits

Professor

Tönu Pullerits. Portrait.

Ultrafast Excitation Transfer and Trapping in a Thin Polymer Film.

Author

  • Mette Grage
  • Yuri Zausjitsyn
  • Arkady Yartsev
  • Mirianas Chachisvilis
  • Villy Sundström
  • Tönu Pullerits

Summary, in English

Transient absorption anisotropy of a polythiophene polymer in a thin film was studied on a femtosecond time scale. The anisotropy has a non-exponential decay on the sub-picosecond time scale, with a fastest component characterized by an ∼40 fs time constant. To simulate the anisotropy decay an incoherent energy migration model has been used. Comparison between the simulated and experimental kinetics enabled us to estimate the nearest-neighbor pair wise hopping time (τh=1±0.1 ps), the fraction of the interchain aggregates (∼10%) and the structural disorder of the polymer. The initial ∼30 fs anisotropy decay does not originate from incoherent hopping energy transfer but from some other relaxation among electronic excited states within a spectroscopic unit.

Department/s

  • Chemical Physics

Publishing year

2003

Language

English

Pages

1-205207

Publication/Series

Physical Review B (Condensed Matter and Materials Physics)

Volume

67

Issue

20

Document type

Journal article

Publisher

American Physical Society

Topic

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1098-0121