Electronic and optical properties of scintillators based on mixed ionic crystals

Abstract

In concentration series of mixed crystal scintillators some properties (light yield, afterglow, resolution) have a non-linear concentration dependence, that differs from the proportional Vegard’s law. There are several types of such dependences with a maximum peaking at 30% (70%) or 50% of the concentration of substitutional ions. The phenomenological model proposed in this work suggests the estimation of modulation of electronic structure by the spatial distribution of the substitutional ions in the crystals. The model takes into account affinity between the ions of different types and allows to connect the scintillation properties observed in the concentration series of mixed crystals.