The effect of fringe fields from patterned magnetic domains on the electroluminescence of organic light-emitting diodes

Nicholas J. Harmon; Markus Wohlgennant; Michael E. Flatté

doi:10.1117/12.2242838

26 September 2016 The effect of fringe fields from patterned magnetic domains on the electroluminescence of organic light-emitting diodes

Nicholas J. Harmon, Markus Wohlgennant, Michael E. Flatté

Author Affiliations +

Proceedings Volume 9931, Spintronics IX; 993102 (2016) https://doi.org/10.1117/12.2242838
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States

Abstract

Large magnetic field effects, either in conduction or luminescence, have been observed in organic light-emitting diodes (OLEDs) for over a decade now. The physical processes are largely understood when exciton formation and recombination lead to the magnetic field effects. Recently, magnetic field effects in some co-evaporated blends have shown that exciplexes deliver even larger responses. In either case, the magnetic field effects arise from some spin-mixing mechanism and spin-selective processes in either the exciton formation or the exciplex recombination. Precise control of light output is not possible when the spin mixing is either due to hyper-fine fields or differences in the Lande g-factor. We theoretically examine the optical output when a patterned magnetic film is deposited near the OLED. The fringe fields from the magnetic layers supply an additionally source of spin mixing that can be easily controlled. In the absence of other spin mixing mechanisms, the luminescence from exciplexes can be modified by 300%. When other spin-mixing mechanisms are present, fringe fields from remanent magnetic states act as a means to either boost or reduce light emission from those mechanisms. Lastly, we examine the influence of spin decoherence on the optical output.

Conference Presentation

Citation Download Citation

Nicholas J. Harmon, Markus Wohlgennant, and Michael E. Flatté "The effect of fringe fields from patterned magnetic domains on the electroluminescence of organic light-emitting diodes", Proc. SPIE 9931, Spintronics IX, 993102 (26 September 2016); https://doi.org/10.1117/12.2242838

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