Luminescence quenching by inter-chain aggregates in substituted polythiophenes

Ruseckas, A., Namdas, E. B., Theander, M., Svensson, M., Yartsev, A., Zigmantas, D., Andersson, M. R., Inganas, O. and Sundstrom, V. (2001) Luminescence quenching by inter-chain aggregates in substituted polythiophenes. Journal of Photochemistry and Photobiology A: Chemistry, 144 1: 3-12. doi:10.1016/S1010-6030(01)00517-2


Author Ruseckas, A.
Namdas, E. B.
Theander, M.
Svensson, M.
Yartsev, A.
Zigmantas, D.
Andersson, M. R.
Inganas, O.
Sundstrom, V.
Title Luminescence quenching by inter-chain aggregates in substituted polythiophenes
Journal name Journal of Photochemistry and Photobiology A: Chemistry   Check publisher's open access policy
ISSN 1010-6030
1873-2666
Publication date 2001-10
Sub-type Article (original research)
DOI 10.1016/S1010-6030(01)00517-2
Volume 144
Issue 1
Start page 3
End page 12
Total pages 10
Place of publication Lausanne, Switzerland
Publisher Elsevier
Language eng
Abstract Time-resolved photoluminescence spectra measured in solid films of two polythiophene derivatives with different chain packing allow to distinguish emission of intra-chain excitations from the luminescence of inter-chain aggregates. Aggregate luminescence is red shifted by about 0.1eV relative to intra-chain emission and shows vibronic coupling to the C=C bond stretch with the Huang-Rhys factor of S≈1.5, which is twice bigger than that of the intra-chain emission. Combining time resolved luminescence data with femtosecond transient absorption, we show that the dynamic quenching of the luminescence in films with dense chain packing is mainly due to excitation energy transfer to aggregates. The radiative lifetime of the lowest excited state of the aggregate with the optical gap of 1.84-1.9eV is estimated to be about 20ns. The aggregate contribution to the total luminescence in the polythiophene films with dense chain packing is about 50% and does not change significantly with temperature.
Keyword Conjugated polymers
Luminescence
Excitation energy transfer
Physical dimers
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
 
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Created: Wed, 09 Mar 2011, 13:19:12 EST