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Thermal evolutions of calcium-tungstate-borate glasses were investigated for the development of luminescent glass-ceramics by using Eu 3+ dopant in a borate glass matrix with calcium tungstate, which was expected to have a combined character of glass and ceramics. This study revealed that single-phase precipitation of CaWO 4 crystals in borate glass matrix was possible by heat-treatment at a temperature higher than glass transition temperature T  g for (100- x ) (33CaO-67B 2 O 3 )- x Ca 3 WO 6 ( x = 8-15 mol%). Additionally, the crystallization of CaWO 4 was found by Raman spectroscopy due to the formation of W=O double bondings of WO 4 tetrahedra in the pristine glass despite starting with the higher calcium content of Ca 3 WO 6 . Eu 3+ ions were excluded from the CaWO 4 crystals and positioned in the borate glass phase as a stable site for them, which provided local environments in higher symmetry around Eu 3+ ions.

Thermal Evolutions to Glass-Ceramics Bearing Calcium Tungstate Crystals in Borate Glasses Doped with Photoluminescent Eu3+ Ions