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Proceedings Paper

Magnetic field effects on current, electroluminescence, and photocurrent in polyfluorene organic light emitting diodes
Author(s): Govindarajan Veeraraghavan; Tho Duc Nguyen; Yugang Sheng; Omer Mermer; Markus Wohlgenannt
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Paper Abstract

We report on the experimental observation of large magnetoresistance in polyfluorene organic light-emitting diodes (OLEDs). Very similar magnetic field effects (MFEs) of comparable magnitude were also observed in electroluminescence and photocurrent measurements. We provide a comprehensive overview of these three types of 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 holeonly OLEDs and show that the MFE acts on the carrier mobility rather than carrier density.

Paper Details

Date Published: 20 April 2006
PDF: 10 pages
Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 619211 (20 April 2006); doi: 10.1117/12.663330
Show Author Affiliations
Govindarajan Veeraraghavan, Univ. of Iowa (United States)
Tho Duc Nguyen, Univ. of Iowa (United States)
Yugang Sheng, Univ. of Iowa (United States)
Omer Mermer, Univ. of Iowa (United States)
Markus Wohlgenannt, Univ. of Iowa (United States)

Published in SPIE Proceedings Vol. 6192:
Organic Optoelectronics and Photonics II
Paul L. Heremans; Michele Muccini; Eric A. Meulenkamp, Editor(s)

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