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Excited state dynamics in alternating polyfluorene copolymers

Jespersen, Kim LU ; Yartsev, Arkady LU ; Pascher, Torbjörn LU and Sundström, Villy LU (2005) In Synthetic Metals 155(2). p.262-265
Abstract
We present the excited state dynamics of the low band gap alternating polyfluorene copolymer, DiO-PFDTBT. The copolymer structure is an alternating sequence of donor and acceptor units consisting of 9,9-dioctyl-9H-fluorene and 4,7-di-thiophen-2-yl-benzo[1,2,5]thiadiazolyl units. Calculations have predicted that the first excited state has charge transfer character, while the second strongly allowed excited state is a delocalized π-conjugated state. We show that the excited state dynamics involves internal conversion (IC) from the second strongly allowed excited state to the first excited state. Furthermore, excitation energy transfer (EET) on the 1–10 ps time scale is observed as well as a subsequent formation of a stabilized long-lived... (More)
We present the excited state dynamics of the low band gap alternating polyfluorene copolymer, DiO-PFDTBT. The copolymer structure is an alternating sequence of donor and acceptor units consisting of 9,9-dioctyl-9H-fluorene and 4,7-di-thiophen-2-yl-benzo[1,2,5]thiadiazolyl units. Calculations have predicted that the first excited state has charge transfer character, while the second strongly allowed excited state is a delocalized π-conjugated state. We show that the excited state dynamics involves internal conversion (IC) from the second strongly allowed excited state to the first excited state. Furthermore, excitation energy transfer (EET) on the 1–10 ps time scale is observed as well as a subsequent formation of a stabilized long-lived emissive state, which has a decay time of 3.25 ns. The origin of this stabilized state is discussed in relation to the intrinsic charge transfer nature of the DiO-PFDTBT. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Synthetic Metals
volume
155
issue
2
pages
262 - 265
publisher
Elsevier
external identifiers
  • wos:000234150000007
  • scopus:28544433039
ISSN
0379-6779
DOI
10.1016/j.synthmet.2005.01.044
language
English
LU publication?
yes
id
ebed762e-709d-4985-b45a-072bebee8ff1 (old id 157804)
date added to LUP
2007-07-03 13:34:57
date last changed
2017-01-01 06:50:52
@article{ebed762e-709d-4985-b45a-072bebee8ff1,
  abstract     = {We present the excited state dynamics of the low band gap alternating polyfluorene copolymer, DiO-PFDTBT. The copolymer structure is an alternating sequence of donor and acceptor units consisting of 9,9-dioctyl-9H-fluorene and 4,7-di-thiophen-2-yl-benzo[1,2,5]thiadiazolyl units. Calculations have predicted that the first excited state has charge transfer character, while the second strongly allowed excited state is a delocalized π-conjugated state. We show that the excited state dynamics involves internal conversion (IC) from the second strongly allowed excited state to the first excited state. Furthermore, excitation energy transfer (EET) on the 1–10 ps time scale is observed as well as a subsequent formation of a stabilized long-lived emissive state, which has a decay time of 3.25 ns. The origin of this stabilized state is discussed in relation to the intrinsic charge transfer nature of the DiO-PFDTBT.},
  author       = {Jespersen, Kim and Yartsev, Arkady and Pascher, Torbjörn and Sundström, Villy},
  issn         = {0379-6779},
  language     = {eng},
  number       = {2},
  pages        = {262--265},
  publisher    = {Elsevier},
  series       = {Synthetic Metals},
  title        = {Excited state dynamics in alternating polyfluorene copolymers},
  url          = {http://dx.doi.org/10.1016/j.synthmet.2005.01.044},
  volume       = {155},
  year         = {2005},
}