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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Abstract

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.

Original languageEnglish
Article number243303
Number of pages6
JournalApplied Physics Letters
Volume109
Issue number24
DOIs
Publication statusPublished - 12 Dec 2016

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