High magnetic field effect in organic light emitting diodes
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概要
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Fluorescent and phosphorescent organic light emitting diodes (OLEDs) were measured in high magnetic field up to 9 T. The current efficiency steeply increased below 100 mT as reported but gradually decreased when the field was larger. In the range of 0.1-6.5 T, the decrease was proportional to the square of the magnetic field, whereas in the range between 6.5 T and 9 T, it was proportional to the square root of the magnetic field. In contrast, phosphorescent OLED did not show magnetic field dependence. Unipolar devices of n-type Alq3 (tris-(8-hydroxyquinolino) aluminum) and p-type α-NPD (N',N'-Di(naphthalene-1-yl)-N,N'-dipheyl-benzidine) showed positive linear magnetoresistance only for minority carriers. The mechanism of the quadratic dependence of the electroluminescent intensity is discussed based on the experimental results.
著者
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HIROSE Yasushi
Kanagawa Academy of Science and Technology (KAST)
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HASEGAWA Tetsuya
Kanagawa Academy of Science and Technology (KAST)
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Hirose Yasushi
Kanagawa Academy Of Science And Technology
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Shimada Toshihiro
Univ. Tokyo Tokyo Jpn
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Shimada Toshihiro
Department Of Materials Chemistry Faculty Of Engineering Hokkaido University
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Hasegawa Tetsuya
Department Of Chemistry Graduate School Of Science The University Of Tokyo
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