Eu oxidation state in fluorozirconate-based glass ceramics

The influence of InF3 doping and remelting on Eu-doped fluorozirconate-based glass ceramics was investigated using near-edge x-ray absorption and optical spectroscopy. It was found that the addition of InF 3 to the melt decreases the Eu2+/Eu3+ mole ratio, while remelting leads to a significant change in the Eu 2+/Eu3+ ratio in favor of Eu2+. Photoluminescence spectroscopy shows that additional annealing steps lead to the formation of BaCl2 nanoparticles in the glass. In as-made glass ceramics containing InF3, a phase transition of the nanoparticles from hexagonal to orthorhombic structure is observed. This phase transition is not observed in the remelted glasses studied here.