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In this paper, by using an equivalent circuit, we examined V–I characteristic curve of an organic light-emitting diode. In this equivalent circuit, according to the multilayer structure of the organic light-emitting diode, intrinsic capacitance and ohmic resistance of layers’ junction are considered as the equivalent circuit elements. We investigated the impacts of temperature and equivalent circuit elements on the V–I characteristic curve. Furthermore, in this equivalent circuit, we have investigated voltage and current curve in term of frequency. Simulation has been done with the help of HSPICE and MATLAB software. The results can be used to improve the efficiency of the structure of organic light-emitting diode.