Energy transfer in solid solutions ZnxMg1−xWO4

Abstract It is shown that the light output of Zn x Mg 1− x WO 4 solid solutions has a maximum at x  = 0.5 under X-ray excitation. Excitation spectra of exciton emission under vacuum ultraviolet excitation also show the increase of the probability of exciton creation by the geminate e–h pairs for the intermediate values of x . Numerical simulation of the relaxation of hot electrons and holes demonstrates that the observed effects are due to the decrease of the mean distance between thermalized charge carriers.