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Interchain photoluminescence in substituted polyfluorenes

Theander, M.; Johansson, D. M.; Ruseckas, A.; Zigmantas, Donatas LU ; Andersson, M. R.; Sundström, Villy LU and Inganas, O. (2001) In Synthetic Metals 119(1-3). p.615-616
Abstract
We have characterised the interchain emitting states of two substituted polyfluorenes with steady-state and time-resolved photoluminescence (PL). Site selective excitation of the interchain state shows that physical dimers are formed in the film. These dimers have low concentration in the films but exciton diffusion to the dimers is reducing the intrachain exciton lifetime. With asymmetrical substituents, the PL quantum yield is higher and the PL lifetime is longer due to lower concentration of dimers. Slow cooling from the melt, gives a new red shifted emission band and less intrachain emission. A discrepancy in the calculated radiative lifetimes suggest a fast formation of this new band.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
photoluminescence, uv-vis-nir absorption, polyfluorenes and derivatives, time-resolved fast spectroscopy
in
Synthetic Metals
volume
119
issue
1-3
pages
615 - 616
publisher
Elsevier
external identifiers
  • scopus:0035867509
ISSN
0379-6779
DOI
10.1016/S0379-6779(00)00788-8
language
English
LU publication?
yes
id
22b9cabf-d36d-46ba-99ef-39c1c5f0717a (old id 1433037)
date added to LUP
2009-07-01 11:38:51
date last changed
2018-05-29 10:23:35
@article{22b9cabf-d36d-46ba-99ef-39c1c5f0717a,
  abstract     = {We have characterised the interchain emitting states of two substituted polyfluorenes with steady-state and time-resolved photoluminescence (PL). Site selective excitation of the interchain state shows that physical dimers are formed in the film. These dimers have low concentration in the films but exciton diffusion to the dimers is reducing the intrachain exciton lifetime. With asymmetrical substituents, the PL quantum yield is higher and the PL lifetime is longer due to lower concentration of dimers. Slow cooling from the melt, gives a new red shifted emission band and less intrachain emission. A discrepancy in the calculated radiative lifetimes suggest a fast formation of this new band.},
  author       = {Theander, M. and Johansson, D. M. and Ruseckas, A. and Zigmantas, Donatas and Andersson, M. R. and Sundström, Villy and Inganas, O.},
  issn         = {0379-6779},
  keyword      = {photoluminescence,uv-vis-nir absorption,polyfluorenes and derivatives,time-resolved fast spectroscopy},
  language     = {eng},
  number       = {1-3},
  pages        = {615--616},
  publisher    = {Elsevier},
  series       = {Synthetic Metals},
  title        = {Interchain photoluminescence in substituted polyfluorenes},
  url          = {http://dx.doi.org/10.1016/S0379-6779(00)00788-8},
  volume       = {119},
  year         = {2001},
}