Magnetic field effects on the conductivity of organic bipolar and unipolar devices at room temperature
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Data
2010-02-01
Autores
Gomez, J. A.
Nueesch, F.
Zuppiroli, L.
Graeff, Carlos Frederico de Oliveira [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V. Sa
Resumo
Magnetic field effects on the conductivity of different types of organic devices: undoped and dye doped aluminium (III) 8-hydroxyquinoline (Alq(3))-based organic light emitting diodes (OLEDs), electron-only Alq(3)-based diodes, and a hole-only N,N'-diphenyl-N,N'-bis(1-naphthyl)1,1'-biphenyl-4,4'-diamine (alpha-NPD)-based diode were studied at room temperature. Only negative magnetoresistance (MR) was observed for the Alq(3)-based devices. The addition of a rubrene dye in Alq(3)-based OLEDs quenches the MR by a factor of 5. The alpha-NPD hole-only device showed only positive MR. Our results are discussed with respect to the actual models for MR in organic semiconductors. Our results are in good agreement with the bipolaron model. (C) 2009 Elsevier B.V. All rights reserved.
Descrição
Palavras-chave
Organic semiconductors, OLEDs, Magnetoresistance, Bipolaron model
Como citar
Synthetic Metals. Lausanne: Elsevier B.V. Sa, v. 160, n. 3-4, p. 317-319, 2010.