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박형준(Hyungjun Park),김현민(Hyunmin Kim),이준신(Junsin Yi),남은경(Eunkyoung Nam),정동근(Donggeun Jung) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
The impedance spectroscopy is one of the effective ways to understand the electrical properties of organic light emitting diodes. The frequency-dependant properties of small molecule based OLEDs have been studied. The equivalent circuit of single-layer device is composed of contact resistance (R<SUB>c</SUB>), bulk resistance (R<SUB>p</SUB>) and bulk capacitance (C<SUB>p</SUB>). The equivalent circuit of double layer device is composed of two parallel circuits connected in series, each of which is a parallel resistor and a capacitor. We have fabricated a double layer device indium-tin-oxide (ITO, anode), N,NV-diphenyl-N,NV-bis(3-methylphenyl)-1,1V-diphenyl-4,4V-diamine (TPD, hole-transporting layer), tris-(8-bydroxyquinoline) aluminum (Alq3, emitting layer), and aluminum (Al, cathode) and two single layer devices (ITO/Alq3/ Al, ITO/TPD/Al).