Numerical simulation and performance enhancement of organic light emitting diodes based on ninhydrin-glycine Schiff base materials

In this work, an in-depth numerical simulation based on drift diffusion and Poisson equation is undertaken to study the efficiency of new ninhydrin-glycine (NG) Schiff base complexes in monolayer organic light emitting diodes (OLED) devices. The Technology Computer-Aided Design (TCAD) simulation prove that NG complex with Al ³⁺ metal exhibit the maximum current and the lowest turn-on voltage compared to the three NG materials with Co ²⁺ , Zn ²⁺ and Fe ³⁺ metals. In the endeavors to achieve better efficiency, we have optimized the OLED device based on Al ³⁺ by improving the electron and hole injections. Thus, an enhanced luminescence of 6752 cd/m ² and a power efficiency equal to 29.12 lmW ⁻¹ are achieved by introducing a PEDOT: PSS hole transporting layer and by replacing aluminum cathode with magnesium.