Magnetic field effects on current, electroluminescence, and photocurrent in polyfluorene organic light emitting diodes

Govindarajan Veeraraghavan; Tho Duc Nguyen; Yugang Sheng; Omer Mermer; Markus Wohlgenannt

doi:10.1117/12.663330

20 April 2006 Magnetic field effects on current, electroluminescence, and photocurrent in polyfluorene organic light emitting diodes

Govindarajan Veeraraghavan, Tho Duc Nguyen, Yugang Sheng, Omer Mermer, Markus Wohlgenannt

Author Affiliations +

Proceedings Volume 6192, Organic Optoelectronics and Photonics II; 619211 (2006) https://doi.org/10.1117/12.663330
Event: SPIE Photonics Europe, 2006, Strasbourg, France

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.

Citation Download Citation

Govindarajan Veeraraghavan, Tho Duc Nguyen, Yugang Sheng, Omer Mermer, and Markus Wohlgenannt "Magnetic field effects on current, electroluminescence, and photocurrent in polyfluorene organic light emitting diodes", Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 619211 (20 April 2006); https://doi.org/10.1117/12.663330

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