Static and dynamic electrical investigations on AVB polymer light-emitting diode

We report investigations of current-voltage (I-V), capacitance-voltage (C-V) and impedance-frequency (Z-omega) measurements performed on ITO/1,4-bis-(9-anthrylvinyl)-benzene (AVB)/Al light-emitting diodes under different bias conditions. These measurements give information about the nature of the conduction mechanism in AVB. It was found that the current is space-charge limited with traps (SCLC) and conductivity exhibits a power low frequency dependence. Moreover, we give an equivalent circuit of the device designed as a parallel resistor R-P and capacitor C-P network in series with resistor R-s. Using experimental data, we deduce numerical values of R-P, C-P and R-s. (C) 2002 Elsevier Science B.V. All rights reserved.