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Impedance characteristics of ITO/Alq(3)/Al organic light-emitting diodes depending on temperature
- Authors
- Ahn, Joon Ho; Lee, Joon-Ung; Kim, Tae Wan
- Issue Date
- Jul-2007
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- organic light-emitting diodes; impedance; temperature; equivalent circuit
- Citation
- CURRENT APPLIED PHYSICS, v.7, no.5, pp.509 - 512
- Journal Title
- CURRENT APPLIED PHYSICS
- Volume
- 7
- Number
- 5
- Start Page
- 509
- End Page
- 512
- ISSN
- 1567-1739
- Abstract
- Temperature-dependent impedance characteristics of TTO/Alq(3)/Al organic light-emitting diodes were studied in the frequency range from 40 to 108 Hz, and the temperature was varied from 10 to 300 K. At each temperature, the frequency-dependent complex impedance was measured under discrete bias voltages from -6 to +20 V, and the voltage-dependent impedance was measured at 10(2) Hz, 10(3) Hz, 10(4) Hz, and 10(5) Hz. A Cole-Cole plot shows that there is one relaxation, and a parallel capacitor-resistor network in series with a contact resistance could be considered as an equivalent electrical circuit to this device. As the temperature decreases, a radius in the Cole-Cole plot increases, which indicates an increase of resistance of the device. (C) 2006 Elsevier B.V. All rights reserved.
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Related Researcher
- Kim, Tae Wan
- Engineering (Applied Science)