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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Samenvatting

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.
Originele taal-2Engels
Artikelnummer197402
Pagina's (van-tot)197402-1/4
TijdschriftPhysical Review Letters
Volume106
Nummer van het tijdschrift19
DOI's
StatusGepubliceerd - 2011

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