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, P.A. Bobbert

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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.
Original languageEnglish
Article number197402
Pages (from-to)197402-1/4
JournalPhysical Review Letters
Volume106
Issue number19
DOIs
Publication statusPublished - 2011

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