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.
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Tyner et al. (1977) studied this question.