Abstract
An external magnetic field can change the current through an organic light-emitting diode and the luminance it emits. Existing models predict that both phenomena have the same behaviour and, therefore, a common origin; however, there are indications that they are not completely linked. As a direct proof, we measured the magnetic field effect in multilayer organic light-emitting diodes using Alq3 as emission layer. After successively adding blocking layers, we found a decrease of the magnetic field effect on the current, whereas the effect on the luminance remained at the same level. Thus, both effects can be separated from each other.
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