Understanding magnetic field effects in organic light-emitting devices

The discovery of magnetic field effects (MFEs) in organic light-emitting devices poses a new challenge for the theoretical studies. Based on the spin-boson theory of magnetotransport that we proposed recently, this article considers various contributions to the MFE. The role of triplet exciton, as an irreducible gradient of the environment in magnetotransport, is discussed extensively. Possible effect of the current caused by secondary charge on the MFE is taken into account to discuss the relation between magnetoresistance and magnetoelectroluminescence. Further experimental correspondence is also discussed.