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Ultrafast Excitation Transfer and Trapping in a Thin Polymer Film.

Grage, Mette LU ; Zausjitsyn, Yuri LU ; Yartsev, Arkady LU ; Chachisvilis, Mirianas LU ; Sundström, Villy LU and Pullerits, Tönu LU (2003) In Physical Review B (Condensed Matter and Materials Physics) 67(20). p.1-205207
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
67
issue
20
pages
1 - 205207
publisher
American Physical Society
external identifiers
  • wos:000183483200034
  • scopus:1442322833
ISSN
1098-0121
DOI
language
English
LU publication?
yes
id
26f76194-a114-46e4-9142-3acd5fe09d9e (old id 128162)
date added to LUP
2007-07-03 11:38:23
date last changed
2018-06-17 04:43:50
@article{26f76194-a114-46e4-9142-3acd5fe09d9e,
  abstract     = {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.},
  author       = {Grage, Mette and Zausjitsyn, Yuri and Yartsev, Arkady and Chachisvilis, Mirianas and Sundström, Villy and Pullerits, Tönu},
  issn         = {1098-0121},
  language     = {eng},
  number       = {20},
  pages        = {1--205207},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Ultrafast Excitation Transfer and Trapping in a Thin Polymer Film.},
  url          = {http://dx.doi.org/},
  volume       = {67},
  year         = {2003},
}