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 and . A huge MEL is predicted when exciton formation is in competition with spin mixing and when is significantly larger than . This competition also leads to a low-field structure in the MEL that is in agreement with recent experiments.
- Received 15 October 2010
DOI:https://doi.org/10.1103/PhysRevLett.106.197402
© 2011 American Physical Society