Temperature-dependent dielectric relaxation in ITO/Alq(3)/Al organic light-emitting diodes
- Authors
- Ahn, Joonho; Kim, Tae Wan; Lee, Won Jae
- Issue Date
- Nov-2012
- Publisher
- KOREAN ASSOC CRYSTAL GROWTH, INC
- Keywords
- Impedance; Organic light-emitting diodes; Temperatures
- Citation
- JOURNAL OF CERAMIC PROCESSING RESEARCH, v.13, pp.S163 - S169
- Journal Title
- JOURNAL OF CERAMIC PROCESSING RESEARCH
- Volume
- 13
- Start Page
- S163
- End Page
- S169
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/18874
- ISSN
- 1229-9162
- Abstract
- Impedance spectroscopy informs electrical properties of materials as accumulated charges, contact status between electrode and organic materials. We carried out impedance spectroscopy of organic light-emitting diodes as ITO/Alq(3)(60 nm)/Al on temperatures from 10 K to 300 K. The result described Z'-Z" plot, cole-cole plot and dielectric relaxation time tau. Z'-Z" plot means that real and imaginary part of materials in organic and electrode by frequencies and temperature. Z' as real part of impedance by applied frequency depending on temperature shows the plateau in low frequency region as R-s + R-p and over 100 kHz in high frequency region as R-s. Cole-cole plot shows resistance of materials in equivalent circuit of the device by temperatures. And equivalent circuit and dielectric relaxation could be accomplished by using the complex impedance analysis.
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