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http://dx.doi.org/10.4313/JKEM.2005.18.11.1038

Dielectric Properties depending on Bias Voltage in Organic Light-emitting Diodes  

Oh, Yong-Cheul (광운대학교 전기공학과)
Lee, Joon-Ung (광운대학교 전기공학과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.18, no.11, 2005 , pp. 1038-1042 More about this Journal
Abstract
We have investigated dielectric properties depending on bias voltage in organic light-emitting diodes using 8-hydroxyquinoline aluminum $(Alq_3)$ as an electron transport and emissive material. We analyzed the dielectric properties of organic light-emitting diodes using impedance of characteristics. Impedance characteristics was measured complex impedance Z and phase $\theta$ in the frequency range of 40 Hz to $10^8$ Hz. We obtained complex electrical conductivity, dielectric constant, and loss tangent $(tan\delta)$ of the device at room temperature. From these analyses, we are able to interpret a conduction mechanism and dielectric properties contributed by an interfacial and orientational polarization.
Keywords
Organic light-emitting diodes; Dielectric loss tangent (tans); Polarization;
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