Evidence for temperature-independent triplet diffusion in a ladder-type conjugated polymer

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Evidence for temperature-independent triplet diffusion in a ladder-type conjugated polymer

M. Reufer, P. G. Lagoudakis, M. J. Walter, J. M. Lupton, J. Feldmann, and U. Scherf

Phys. Rev. B 74, 241201(R) – Published 8 December 2006

Abstract

We study the temperature dependence of triplet formation and decay by considering the phosphorescence dynamics in a prototypical conjugated polymer matrix. The dynamics of triplet formation as a function of temperature are unraveled by applying an electric field during optical singlet generation and recording the phosphorescence quenching. The diffusivity of triplet excitons in conjugated polymers is shown to be independent of temperature up to $200 K$ . We propose a diffusion model that describes the relaxation dynamics of triplet excitons at all times through triplet-triplet annihilation and spin orbit coupling at static heavy atom sites.

Received 24 August 2006

DOI:https://doi.org/10.1103/PhysRevB.74.241201

Authors & Affiliations

M. Reufer¹, P. G. Lagoudakis^1,2,*, M. J. Walter¹, J. M. Lupton¹, J. Feldmann¹, and U. Scherf³

¹Photonics and Optoelectronics Group, Department of Physics and CeNS, Ludwig-Maximilians-Universität, 80799 Munich, Germany
²School of Physics & Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom
³FB Chemie, Universität Wuppertal, Gauss-Str. 20, 42097 Wuppertal, Germany

^*Author to whom correspondence should be addressed. Electronic address: Pavlos.Lagoudakis@soton.ac.uk

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Vol. 74, Iss. 24 — 15 December 2006

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