Studies of the luminescence efficiency of tungstate and molybdate phosphors as a function of temperature and high pressure

Studies have been made of the luminescence properties of three molybdate and three tungstate phosphors as a function of temperature and pressure. The data include peak energy, half-width, peak shape (skewness), luminescent lifetime, and integrated intensity. The modifications of the high pressure luminescence technique which permit these measurements, especially of the intensities as a function of temperature and pressure, are described. The data are analyzed in terms of a quantum mechanical single configuration coordinate model developed by Struck and Fonger. For most of the compounds studied the changes of intensity and lifetime can be reasonably correlated with the observed changes in peak energy and shape.