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–ω) 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 Rp and capacitor Cp network in series with resistor Rs. Using experimental data, we deduce numerical values of Rp, Cp and Rs.