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This paper reports an optical investigation of glass–ceramics formed by annealing glasses with compositions 50 GeO 2 –40 PbO–10 PbF 2 –x EuF 3 , x=[0.5;1;1.5;2] and polycrystalline ceramics with composition 100 PbF 2 , y EuF 3 , with y=5,10,15 and 20. For each material, the photoluminescence spectrum and the photoluminescence lifetimes of the 5 D ...
Europium-doped lead germanate and lead fluorogermanate glasses are studied by using differential thermal analysis, X-ray diffraction, photoluminescence and fluorescence lifetimes measurements of the 5 D j , j=0, 1, 2 levels. PbF 2 addition increases the thermal stability of the lead germanate glass, while Eu 3+ ions promote the crystallization of β-PbF 2 :Eu...
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