Discovering excited states; an innovative technique for the study of recombination pathways

Abstract

This study introduces a new experimental approach to investigate the stimulated luminescence of three different materials: LBO (LiB4O7: Cu, In), MBO (MgB4O7: Dy, Na), and BeOR (BeO: Cr, Mg, Sn). The goal is to utilize three phenomenological models (localized, de-localized, and semi-localized) to explore recombination pathways, specifically the two mechanisms where electrons follow either the conduction band or an excited state. The modified protocol includes a single high dose with continuous Prompt Isothermal Decay (PID) measurements, allowing for two different methods to be used simultaneously in the resulting signal. The study concludes that the protocol can effectively analyze the recombination pathways of all three materials, with a focus on BeOR's potential transition between localized and de-localized mechanisms. This result strengthens the combined phenomenological model and highlights the possibility of calculating energy values through this approach. The paper also introduces a method that includes the localized state theory, in addition to the normal general order kinetic model, for the second step of the analysis. By studying the concentration of electrons and the de-excitation coefficient throughout the experiments, a better understanding of luminescence features and phenomena is possible.