Ce,Tb-doped Y2SiO5 phosphor luminescence emissions modeling and simulation

Abstract

White light-emitting diodes offer the possibility of efficient, safe, and reliable solid-state lighting, and thus have various applications in artificial lighting. Reported white light-emitting phosphors usually contain rare-earth metals and are generally prepared by high-energy processes. The purpose of this research is the modeling and simulation of the molar percentages of cerium and terbium required to be incorporated into a yttrium silicate (Y2SiO5:Ce,Tb) crystal structure for luminescent emission. The input data used for the modeling process comes from experiments with a set of molar concentrations of cerium and terbium ranging from 0.5 to 2%, and, from 1 to 6%, respectively; chromaticity coordinates are obtained from the photoluminescence spectra generated by the luminescent materials. With the information above, a simulation based on the proposed mathematical model was performed in order to obtain the approximation of the luminescent response of the molar concentrations whose experiments were not carried out in the laboratory. To demonstrate the results of the model and its simulation, a tool developed in the agent-based platform NetLogo is presented, which allows the user to observe the trend of the chromaticity coordinates for different molar percentages of cerium and cerium into yttrium silicate crystal structures.