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

We report on the experimental characterization of a recently discovered large magnetoresistive effect in polyfluorene and in Alq3 organic light-emitting diodes. We also observe similar magnetic field effects (MFEs) of comparable magnitude in electroluminescence and photocurrent measurements. We prov...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2007-01, Vol.19 (3), p.036209-036209 (13)
Main Authors: Veeraraghavan, G, Nguyen, T D, Sheng, Y, Mermer, O, Wohlgenannt, M
Format: Article
Language:English
Subjects:
Applied sciences
Electronics
Exact sciences and technology
Optoelectronic devices
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
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Summary:We report on the experimental characterization of a recently discovered large magnetoresistive effect in polyfluorene and in Alq3 organic light-emitting diodes. We also observe similar magnetic field effects (MFEs) of comparable magnitude in electroluminescence and photocurrent measurements. We provide a comprehensive overview of all these three types of MFE. To the best of our knowledge, the mechanism causing these MFEs is not currently known with certainty. Moreover, we show that experiments in bipolar, electroluminescent devices do not allow determination of whether the MFE acts on the carrier density or carrier mobility, making any attempt at explaining it ambiguous. As a remedy, we perform magnetoresistance measurements in hole-only polyfluorene devices and show that the MFE acts on the carrier mobility rather than carrier recombination.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/19/3/036209