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Carrier Dynamics in Poly(Octylthiophene) Gels

Published online by Cambridge University Press:  21 March 2011

J-C Vial ,
B. Pépin-Donat ,
A. Viallat  and
P. Fedorko
J-C Vial
Affiliation:
Lab. de Spectrométrie Physique, UMR C5588 (Univ. J. Fourier-CNRS) BP87, 38402 Saint Martin d'Hères cedex, France
B. Pépin-Donat
Affiliation:
Lab. de physique des métaux synthétiques, UMR 5819 (CNRS-CEA-Univ. J. Fourier) CEA- Grenoble, 17 Avenue des Martyrs, 38054 Grenoble Cedex 9, France
A. Viallat
Affiliation:
Lab. de Spectrométrie Physique, UMR C5588 (Univ. J. Fourier-CNRS) BP87, 38402 Saint Martin d'Hères cedex, France
P. Fedorko
Affiliation:
Lab. de physique des métaux synthétiques, UMR 5819 (CNRS-CEA-Univ. J. Fourier) CEA- Grenoble, 17 Avenue des Martyrs, 38054 Grenoble Cedex 9, France Slovak University of Technology, 81237 Bratislava, Slovakia.
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Abstract

Carrier dynamics properties in swollen poly(octylthiophene) gels are investigated via their radiative and non-radiative recombination rates (Wr and Wnr respectively) as a function of their swelling ratio (Q). Photoluminescence decay time (τ, in the picosecond range) and luminescence quantum efficiency (QE) are found to strongly increase with Q. This implies that Wr increases and Wnr decreases as Q increases; such a result cannot be understood if one accounts only for the well-known dilution effect observed for organic dyes. Our interpretation is that the enhanced carrier transport due to the increase of interchain interactions observed upon deswelling induces a separation of carriers. Then, these latter present an increased probability to find non-radiative traps. Variation of the conductivity versus Q in doped gels is also discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 660: Symposia JJ – Organic Electronic & Photonic Materials and Devices , 2000 , JJ8.22
Copyright
Copyright © Materials Research Society 2001

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References

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