Magnetic-Field Dependence of the Electroluminescence of Organic Light-Emitting Diodes: A Competition between Exciton Formation and Spin Mixing

S. P. Kersten, A. J. Schellekens, B. Koopmans, and P. A. Bobbert
Phys. Rev. Lett. 106, 197402 – Published 13 May 2011
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Abstract

We explore the magnetoelectroluminescence (MEL) of organic light-emitting diodes by evaluating the magnetic-field dependent fraction of singlet excitons formed. We use two- and multisite polaron-hopping models with spin mixing by hyperfine fields and different singlet and triplet exciton formation rates kS and kT. A huge MEL is predicted when exciton formation is in competition with spin mixing and when kT is significantly larger than kS. This competition also leads to a low-field structure in the MEL that is in agreement with recent experiments.

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  • Received 15 October 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.197402

© 2011 American Physical Society

Authors & Affiliations

S. P. Kersten*, A. J. Schellekens, B. Koopmans, and P. A. Bobbert

  • Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

  • *s.p.kersten@tue.nl
  • p.a.bobbert@tue.nl

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Issue

Vol. 106, Iss. 19 — 13 May 2011

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