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Evidence for different origins of the magnetic field effect on current and electroluminescence in organic light-emitting diodes
4. Ö. Mermer, G. Veeraraghavan, T. L. Francis, Y. Sheng, D. T. Nguyen, M. Wohlgenannt, A. Köhler, M. K. Al-Suti, and M. S. Khan, Phys. Rev. B 72, 205202 (2005).
6. U. Niedermeier, Ph.D. dissertation (Technische Universität Darmstadt, 2010).
18. W. Wagemans, Ph.D. dissertation (Eindhoven University of Technology, 2010).
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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 fieldeffect in multilayer organic light-emitting diodes using Alq3 as emission layer. After successively adding blocking layers, we found a decrease of the magnetic fieldeffect 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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