Journal of Ceramic Processing Research
- 제13권spc2호
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- Pages.163-165
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- 2012
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- 1229-9162(pISSN)
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- 2672-152X(eISSN)
Temperature-dependent dielectric relaxation in ITO/Alq3/Al organic light-emitting diodes
- Ahn, Joonho (Electric Industry Research Institute of Korea) ;
- Kim, Tae Wan (Department of Physics, Hongik University) ;
- Lee, Won Jae (Department of Electronic Engineering, Gachon University)
- 발행 : 2012.11.01
초록
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/Alq3(60 nm)/Al on temperatures from 10 K to 300 K. The result described Z'-Z" plot, cole-cole plot and dielectric relaxation time τ. 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 Rs+ Rp and over 100 kHz in high frequency region as Rs. 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.