Abstract
The luminescence properties of Ce3+‐ and Tb3+‐activated and of Tb3+‐activated are reported. It is shown that activated with Tb3+ is an excellent phosphor both under UV and x‐ray excitation. In both types of compounds there are two different Ln3+ sites available for the activator ions, Ce3+ and Tb3+. The results show that the activator ions are incorporated on both sites. The differences in the luminescence properties due to the two types of activator sites are ascribed to the presence of oxygen ions which are coordinated to Ln3+ ions only and do not belong to any silicate group. The excitation spectra of the Tb3+ emission of these compounds show excitation bands due to spin‐forbidden and spin‐allowed Tb3+ 4f‐5d transitions. The positions of these bands can be predicted using the data of the Ce3+‐activated samples.
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