Abstract
We present results of a high-pressure photoluminescence study ofMn- and Ca-doped gadolinium gallium garnet (GGG) crystals. Since theMn4+ ion has the same electronic structure of the open3d3 shellas Cr3+, its spectroscopic properties are expected to be similar to those ofthe Cr-doped GGG. We observed the luminescence R-lines of variousMn4+ centres in GGG. In the 0–118 kbar pressure range those R-lines shiftlinearly to lower energies. The pressure coefficients are of the order of2 cm−1 kbar−1, about three timeslarger than that for Cr3+ ions. This fact can be explained by different strength of coupling of isoelectronicCr3+ and Mn4+ ions with GGG host. The changes of the radiative decay times of theMn4+ centres as a function of pressure are fitted with a theoretical model.
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