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Effect of Y3+ on the structural and photoluminescence properties of yttrium doped sodium borate glasses.

Glasses of the composition 70%B2 O3 -(30-x)%Na2 O-x%Y2 O3 with x=0, 0.5, 1, 1.5, 2 and 2.5 mole% are manufactured by the melt quenching method. X-ray diffraction test indicate the amorphous structure of the glasses, with the presence of some YBO3 clusters in the high yttrium content samples. The FTIR analysis proved the presence of different borate groups and linkages, in addition to nonsystematic changes of the ratio BO3 /BO4 in the glasses. Forming ability of the glasses is found approximately stable for the low Y3+ content samples and increases for the heavily doped samples. Density of the samples is found to increase as the Y3+ concentration increases, while the molar volume decreases. The bond strength of the examined glasses suggests the covalent nature is dominant between bonds. All of the Y3+ doped glasses are found to emit greenish-cyan light when excited by λ ex = 365 nm . The photoluminescence intensity is shown to be enhanced by the generated YBO3 groups. The obtained correlated color temperature values with 82.5% purity recommend the suitability of these glasses for the applications in the outdoor illumination.