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Magnetoresistance and Magnetic Field Effect on Electroluminescence in Polyfluorene OLEDs

Published online by Cambridge University Press:  01 February 2011

Govindarajan Veeraraghavan ,
Tho Duc Nguyen ,
Yugang Sheng ,
Omer Mermer  and
Markus Wohlgenannt
Govindarajan Veeraraghavan
Affiliation:
[email protected], University of Iowa, Department of Electrical and Computer Engineering, 188 IATL, University of Iowa, Iowa City, IA, 52242, United States
Tho Duc Nguyen
Affiliation:
[email protected], University of Iowa, Department of Physics and Astronomy, Optical Science and Technology Center, 188 IATL, University of Iowa,, Iowa City, IA, 52242, United States
Yugang Sheng
Affiliation:
[email protected], University of Iowa, Department of Physics and Astronomy, Optical Science and Technology Center, 188 IATL, University of Iowa, Iowa City, IA, 52242, United States
Omer Mermer
Affiliation:
[email protected], University of Iowa, Department of Physics and Astronomy, Optical Science and Technology Center, 188 IATL, University of Iowa, Iowa City, IA, 52242, United States
Markus Wohlgenannt
Affiliation:
[email protected], University of Iowa, Department of Physics and Astronomy, Optical Science and Technology Center, 188 IATL, University of Iowa, Iowa City, IA, 52242, United States
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Abstract

We report on the experimental observation of large magnet field effect (MFE) on current and electroluminescence (EL) in polyfluorene organic light emitting diodes (OLEDs). We provide a comprehensive overview of the observed MFE. To the best of our knowledge, the mechanism causing these MFE is currently not known. Moreover, we show that these experiments do not allow determination whether the MFE acts on the carrier density or carrier mobility making any attempt of explaining it ambiguous. As a remedy, we performed magnetoresistance measurements in hole-only OLEDs and show that the MFE acts on the carrier mobility rather than carrier density.

Keywords

organicmagnetoresistance (transport)polymer
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 937: Symposium M – Conjugated Organic Materials – Synthesis, Structure, Device, and Applications , 2006 , 0937-M10-04
Copyright
Copyright © Materials Research Society 2006

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