Abstract
The luminescence properties of the Eu 3+ ion in the crystalline and glass modifications of LnBGeO 5-type compositions ( Ln = La, Gd, Y, and CaBPO 5) are investigated. The efficiency of the luminescence upon broad band excitation is higher in the crystals than it is in the glasses. Whereas crystalline GdBGeO 5:Eu is a very efficient luminescent material, crystalline LaBGeO 5:Eu and CaBPO 5:Eu show only medium efficiency, and the glass modifications are of a low to very low efficiency. The influence of the charge and the size of the ion for which Eu 3+ is substituted is discussed. The influence of these cations on the efficiency of the luminescence of the Eu 3+ ion is well known for crystalline compositions, but is observed for the first time in the glass modifications, where they play the role of network modifiers. The undoped compositions show a blue luminescence. Further we observed Eu 2+ emission in the europium-doped CaBPO 5 glass. It shows inhomogeneous broadening, so that not only broad band but also a small amount of sharp line emission could be observed.
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