| Title |
A Study on the Dielectric Polarization of ITO/Alq_3/Al Structure Organic Light-emitting Diodes |
| Authors |
오용철(Oh, Yong-Cheul) ; 신철기(Shin, Cheol-Gi) ; 김충혁(Kim, Chung-Hyeak) |
| Keywords |
OLEDs ; Alq_3 ; Dielectric loss tangent(tanδ) ; Polarization |
| Abstract |
We have investigated dielectric polarization in organic light-emitting diodes using 8-hydroxyquinoline aluminum(Alq_3) as an electron transport and emissive material. We analyzed the dielectric polarization of organic light-emitting diodes using characteristics of impedance and equivalent circuit of ITO/Alq_3/Al. Impedance characteristics was measured complex impedance Z and phase θ in the frequency range of 1×40Hz to 1×10^8Hz. We obtained complex electrical conductivity, dielectric constant, and loss tangent(tanδ) of the device at room temperature. And, we obtained the equivalent circuit of ITO/Alq_3/Al through analyzing dielectric constant and dielectric loss tangent. From these analyses, we could interpret a conduction mechanism and dielectric polarization. |