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Using coherent dynamics to quantify spin coupling within triplet-exciton/polaron complexes in organic diodes

W. J. Baker, T. L. Keevers, C. Boehme, and D. R. McCamey
Phys. Rev. B 92, 041201(R) – Published 2 July 2015
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Abstract

Quantifying the spin-spin interactions which influence electronic transitions in organic semiconductors is crucial for understanding their magneto-optoelectronic properties. By combining a theoretical model for three spin interactions in the coherent regime with pulsed electrically detected magnetic resonance experiments on π-conjugated polymer diodes (poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene]), we quantify the spin coupling within complexes comprising three spin-1/2 particles. We determine that these particles form triplet-exciton/polaron pairs, where the polaron-exciton exchange is over five orders of magnitude weaker (<170 MHz) than that within the exciton. This approach provides a direct spectroscopic approach for distinguishing between coupling regimes, and to test hypotheses relating microscopic properties to bulk characteristics of organic electronic devices.

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  • Received 4 February 2015
  • Revised 13 April 2015

DOI:https://doi.org/10.1103/PhysRevB.92.041201

©2015 American Physical Society

Authors & Affiliations

W. J. Baker1,2,3, T. L. Keevers1, C. Boehme3, and D. R. McCamey1,*

  • 1School of Physics, UNSW, Sydney, New South Wales 2052, Australia
  • 2Centre for Quantum Computation and Communication Technology, UNSW, Sydney, New South Wales 2052, Australia
  • 3Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA

  • *dane.mccamey@unsw.edu.au

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Issue

Vol. 92, Iss. 4 — 15 July 2015

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