The systems MF 2 ‐ AlF 3 ( M = Ca , Sr , or Ba ) were investigated and the compounds and their fluorescence with Eu +2 were determined. In these compounds, Eu 2+ activation results in two distinct types of emission, a band emission from 5d to 4f transitions typically found for Eu +2 in other matrices and line emissions from 4f to 4f transitions, similar to those of the isoelectronic Gd +3 .
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Mary V. Hoffman (1971) studied this question.
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