Dysprosium-Doped Glass-Ceramics From the System NaO-AlO-SiO-BO-DyO.

Glasses from the system NaO-AlO-SiO-BO-DyO are prepared with three different concentrations of the Dy ion-0.5, 1, and 2 at%. Glass-ceramics are obtained after thermal treatment of the parent glass at 580°С and 630°С during 2, 5, and 24 h. The crystallizing phases, the crystallinity degree, and the nano crystalline size are determined. The crystallizing phases after thermal treatment are NaAlSiO in two different modifications and NaBO. XRD analyses show the presence of third unknown phase in some samples. Emission and excitation spectra of the glass-ceramics show the characteristic peaks of Dy (F → H, F → H and F → H at 483, 575, and 668 nm, respectively). The yellow peak is dominating in all samples. The spectra show different intensity depending on the Dy concentration, temperature, and time of the thermal treatment. This result suggests that the emission color can be controlled by these three factors.