Abstract
Studies on correlating luminescence with thermally induced structural transformations of gadolinium sulfate octahydrate are reported. Different phases such as amorphous and crystalline anhydrous sulfate, oxysulfate, oxysulfide and oxide were identified by powder diffraction patterns. Sulfate and oxysulfate showed changes in Gd3+ luminescence intensities with the structure. Gd3+ emission is totally quenched in oxysulfide and oxide. Luminescence intensities correlate with Gd-Gd distances. Shorter the distance, less is the intensity. In gadolinium sulfate octahydrate, efficient sensitization of Tb3+ luminescence could be achieved through energy transfer from Gd3+. Such sensitization, on the other hand, for Dy3+ could be observed only in the anhydrous phase.
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