Abstract. We have studied electroluminescence and impedance properties of exciplex-type organic light-emitting devices (OLEDs) based on 4,4,4″-tris[3-methylphenyl(phenyl)-aminotriphenylamine (m-MTDATA) and 4,7-diphenyl-1,10-phenanthroline (Bphen), which depend on the technologies applied to form active layers of the devices. A comparative analysis of the current-voltage characteristics and impedance spectroscopy of the layered and composite devices have revealed the influence of device technology on the injection of charge carriers in the active layers of OLED structures. We have found a correlation between the negative capacitance observed at low frequencies in the exciplex-type layered OLEDs and the emitting recombination processes.

The paper has been shown the results of the study of the parameters of organic light-emitting structures based on the SPICE (Simulation Program with Integrated Circuit Emphasis) model studies. A SPICE model of diode structure has been developed, which is implemented in the form of a substitution scheme based on the basic components of the simulator. This model can be extended by introducing additional components of the substitution scheme, which provides higher accuracy in representing the structure specifics. Graphical results of researches of the model of OLED structure at the change of internal parameters have been presented. The obtained data well represent the parameters of real structures and are characterized by a fairly effective adaptation to the experimental data of specific samples.

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