The effect of pressure and temperature on peak energy and shape, intensity, and luminescence lifetime of a series of alkaline earth compounds doped with Eu2+ has been measured. The results are analyzed in terms of a quantum mechanical single configuration coordinate model. The quenching of the luminescence cannot be explained in terms of a two state model. It is possible to postulate the presence of a third state which accounts for the quenching. The properties of this third state vary in a reasonable and internally consistent manner among the compounds.

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.

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