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Spin-Orbital Coupling Effects on Magnetoresistance in Organic Light-Emitting Diodes

Published online by Cambridge University Press:  26 February 2011

Bin Hu  and
Yue Wu
Bin Hu
Affiliation:
[email protected], University of Tennessee, Department of Materials Science and Engeering, 608 Dougherty Hall, Knoxville, TN, 37996, United States, 1-865-974-3946
Yue Wu
Affiliation:
[email protected], University of Tennessee, Department of Materials Science and Engineering, Knoxville, TN, 37996, United States
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Abstract

The magnetoresistance of conjugated polymer poly [2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) based organic light-emitting diodes (OLED) was investigated at both forward and reverse bias at liquid nitrogen temperature. We find that the reverse bias yields a largely increased magnetoresistance when the electron-hole capture zone is away from the metal electrode as compared to the forward bias with the electron-hole capture zone close to the metal electrode. The electroluminescence suggests that the deposited metal atoms enhance the spin-orbital coupling at the polymer/metal interface and consequently lead to electron-hole capture zone-dependent magnetic field effects in organic semiconductor devices.

Keywords

luminescencemagnetoresistance (magnetic)optoelectronic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 965: Symposium S – Organic Electronics – Materials, Devices and Applications , 2006 , 0965-S03-08
Copyright
Copyright © Materials Research Society 2007

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