SIMULATION AND ANALYSIS OF ELECTRO-OPTICAL CHARACTERISTICS OF ORGANIC COMPOUNDS IN ORGANIC LIGHT-EMITTING DIODES (OLEDs)

Abstract

Organic light emitters (OLEDs) work according to the principles of electroluminescence. These OLEDs are commercially available and can be used in smartphone and television displays due to their low power consumption, flexibility and higher brightness than inorganic de-vices. The copolymer based on 3,4-ethylene dioxythiophene (EDOT) and poly(N-vinylcarbazole) (PVK) was synthesized using previously published procedures. The copolymer was synthesized by an oxidative copolymerization reaction, while the DFT/B3LYP/6-31G(d,p) density function theory method was used to perform quantum calculations. This paper presents the simulation results by SILVACO-TCAD simulation software of the PVK-PEDOT organic matrix with calcium as cathode and ITO as anode. The simulation is based on the distribution of the Langevin recombination model including the proposed structure, and the electrical and optical characteristics, such as current versus voltage, luminescence power, and current versus electric field for different thicknesses, and charge carrier densities of the emitting layer, as well as the I-V characteristics for different temperature values. The model presented here will be useful in the future for optimization of better electrical parameters.