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Exciton diffusion and relaxation in methyl-substituted polyparaphenylene polymer films

Gulbinas, V; Mineviciute, I; Hertel, D; Wellander, R; Yartsev, Arkady LU and Sundström, Villy LU (2007) In Journal of Chemical Physics 127(14).
Abstract
Exciton diffusion in ladder-type methyl-substituted polyparaphenylene film and solution was investigated by means of femtosecond pump-probe spectroscopy using a combined approach, analyzing exciton-exciton annihilation, and transient absorption depolarization properties. We show that the different views on the exciton dynamics offered by anisotropy decay and annihilation are required in order to obtain a correct picture of the energy transfer dynamics. Comparison of the exciton diffusion coefficient and exciton diffusion radius obtained for polymer film with the two techniques reveals that there is substantial short-range order in the film. Also in isolated chains there is considerable amount of order, as revealed from only partial... (More)
Exciton diffusion in ladder-type methyl-substituted polyparaphenylene film and solution was investigated by means of femtosecond pump-probe spectroscopy using a combined approach, analyzing exciton-exciton annihilation, and transient absorption depolarization properties. We show that the different views on the exciton dynamics offered by anisotropy decay and annihilation are required in order to obtain a correct picture of the energy transfer dynamics. Comparison of the exciton diffusion coefficient and exciton diffusion radius obtained for polymer film with the two techniques reveals that there is substantial short-range order in the film. Also in isolated chains there is considerable amount of order, as revealed from only partial anisotropy decay, which shows that only a small fraction of the excitons move to differently oriented polymer segments. It is further concluded that interchain energy transfer is faster than intrachain transfer, mainly as a result of shorter interchain distances between chromophoric units. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Chemical Physics
volume
127
issue
14
publisher
American Institute of Physics
external identifiers
  • wos:000250140800065
  • scopus:35248823234
ISSN
0021-9606
DOI
10.1063/1.2790901
language
English
LU publication?
yes
id
d7a9c1bc-ce2f-4bca-bdb2-41de2d05b243 (old id 655209)
date added to LUP
2007-12-07 13:40:33
date last changed
2017-08-27 04:04:43
@article{d7a9c1bc-ce2f-4bca-bdb2-41de2d05b243,
  abstract     = {Exciton diffusion in ladder-type methyl-substituted polyparaphenylene film and solution was investigated by means of femtosecond pump-probe spectroscopy using a combined approach, analyzing exciton-exciton annihilation, and transient absorption depolarization properties. We show that the different views on the exciton dynamics offered by anisotropy decay and annihilation are required in order to obtain a correct picture of the energy transfer dynamics. Comparison of the exciton diffusion coefficient and exciton diffusion radius obtained for polymer film with the two techniques reveals that there is substantial short-range order in the film. Also in isolated chains there is considerable amount of order, as revealed from only partial anisotropy decay, which shows that only a small fraction of the excitons move to differently oriented polymer segments. It is further concluded that interchain energy transfer is faster than intrachain transfer, mainly as a result of shorter interchain distances between chromophoric units.},
  author       = {Gulbinas, V and Mineviciute, I and Hertel, D and Wellander, R and Yartsev, Arkady and Sundström, Villy},
  issn         = {0021-9606},
  language     = {eng},
  number       = {14},
  publisher    = {American Institute of Physics},
  series       = {Journal of Chemical Physics},
  title        = {Exciton diffusion and relaxation in methyl-substituted polyparaphenylene polymer films},
  url          = {http://dx.doi.org/10.1063/1.2790901},
  volume       = {127},
  year         = {2007},
}