Modeling of positive and negative organic magnetoresistance in organic light-emitting diodes
Physical Review B - Condensed Matter and Materials Physics
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The organic magnetoresistance of aluminium tris(8-hydroxyquinoline) based organic light-emitting diodes has been modeled using the triplet polaron interaction coupled with exciton dissociation. We have demonstrated that each of the processes is proportional to the exciton concentration over a wide range of operating conditions for a number of devices with a wide range of layer thicknesses. This work demonstrates that using a magnetic field to perturb the operation of a working organic device is particularly valuable in that it provides a new technique for studying a range of processes affecting current transport such as polaron trapping, triplet-polaron interactions, and exciton dissociation in fully working devices. © 2012 American Physical Society.