Dielectric properties depending on frequency in organic light-emitting diodes

Joon Ho Ahn, Ho Shik Lee, Dae Shik Seo, Kyung Uk Jang, Won Jae Lee, Tae Wan Kim

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Dielectric properties of organic light-emitting diodes were investigated using ITO/Alq3/Al device. In spite of various advantages in organic light-emitting diodes, a fundamental study on physical properties is not yet sufficient. Dielectric properties are used for studying fundamental physical properties of materials through a frequency-dependent response. We have investigated magnitude and phase of impedance, electrical conductivity, and the dielectric loss depending on a bias-voltage variation using ITO/Alq3(60 nm)/Al device. The device shows a frequency-dependent response such that a major contribution is resistive below time constant and capacitive above time constant. Also, the device shows a voltage-dependent electrical conductivity in low-frequency region. A bulk resistance rapidly decreases as the frequency increases above 1 MHz. The dielectric loss shows that there appears an interfacial polarization in low-frequency region, and an orientational polarization in high-frequency region.

Original languageEnglish
Pages (from-to)2626-2629
Number of pages4
JournalThin Solid Films
Issue number9
Publication statusPublished - 2008 Mar 3

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry


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