Abstract
The family of Sillen phases consists of compounds where layers of the quadratic complex cation (BiO) 2 2+ alternate with layers of perovskite-like structures of the form A n−1 B n O 3 n + 1 . We synthesized compounds with 1 ⩽ n ⩽ 5 containing titanium, niobium or tungsten as the other cations. The fluorescence spectrum of Eu 3+ embedded in these matrices is very complicated in view of the various point sites occupied by the rare earth. The dye laser selective excitation technique enables three different point sites to be analysed.
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