Optical luminescence of electronic and vibronic transitions in Gd 2− xY x(SO 4) 3 · 8H 2O

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X-ray and ultraviolet-excited emission spectra of Gd 2(SO 4) 3 · 8H 2O show the electronic 6P 3/2,5/2,7/2, → 8S 7/2,lines of Gd 3+ accompanied by vibronics involving the water and sulfate vibrations. Removal of the water of hydration by heating eliminates the water vibronics, while the spectrum of Gd 2(SO 4) 3 · 8D 2O exhibits the expected shift toward the electronic origin of vibronics attributed to the water of hydration. In a dilute system of composition Gd 0.8Y 1.2(SO 4) 3 · 8H 2O we also see the 6D J, 6I J → 8S 7/2level transitions.