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APS » Journals » Phys. Rev. B » Volume 74 » Issue 24
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Phys. Rev. B 74, 241201(R) (2006) [4 pages]

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

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M. Reufer1, P. G. Lagoudakis1,2,*, 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

Received 24 August 2006; revised 31 October 2006; published 8 December 2006

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.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.74.241201
DOI:
10.1103/PhysRevB.74.241201
PACS:
78.55.Kz, 78.60.Fi, 78.66.Qn, 85.60.Jb

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

 
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