Manipulation of the electroluminescence of organic light-emitting diodes via fringe fields from patterned magnetic domains

N.J. Harmon, M. Wohlgenannt, M.E. Flatté

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Samenvatting

We predict very large changes in the room-temperature electroluminescence of thermally-activated delayed fluorescence organic light emitting diodes near patterned ferromagnetic films. These effects exceed the changes in a uniform magnetic field by as much as a factor of two. We describe optimal ferromagnetic film patterns for enhancing the electroluminescence. A full theory of the spin-mixing processes in exciplex recombination and how they are affected by hyperfine fields, spin-orbit effects, and ferromagnetic fringe field effects is introduced. These spin-mixing processes are used to describe the effect of magnetic domain structures on the luminescence in various regimes. This provides a method of enhancing light emission rates from exciplexes and also a means of efficiently coupling information encoded in the magnetic domains to organic light emitting diode emission.

Originele taal-2Engels
Artikelnummer243303
Aantal pagina's6
TijdschriftApplied Physics Letters
Volume109
Nummer van het tijdschrift24
DOI's
StatusGepubliceerd - 12 dec 2016

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