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.