Analysis of emission of Eu³⁺ and Dy³⁺ doped Magnesium Boro-Tellurite (MBT) ceramics

Rare earth (RE) ions play an important role in the improvement of the optical properties of ceramics. Rare-earth ceramics are commonly used in display panels, fluorescent lamps and lasers. The luminescence properties of Magnesium Boro-Tellurite (MBT) Eu³⁺ and Dy³⁺ doped ceramics have not been reported before. Therefore, the aim of this paper is to determine the effect of different compositions on the luminescence properties of the MBT material. A series of xTeO₂-(70-x)B₂O₃-30MgO ceramics with 10 ≤ x ≤ 40 mol % doped with 1 mol % of Eu³⁺ and Dy³⁺ ions was prepared via the solid-state reaction method. The influence of various compositions on the crystalline phase and photoluminescence properties of the samples were investigated by X-ray diffraction (XRD) and luminescence spectroscopy. The crystalline phases obtained in this study are Mg₃(BO₃)₂, MgB₄O₇, Mg₂B₂O₅, Mg(Te₂O₅) and MgTe₃O₆. It was stated that the crystalline phases have not changed as a result of doping with Eu³⁺ and Dy³⁺ ions. The emission spectra of Eu³⁺: MBT ceramics showed strong red emission at 612 nm due to the transition of ⁵D₀ → ⁷F₂ and meanwhile, the Dy³⁺: MBT ceramics showed a blue emission at 480 nm due to ⁴F_9/2 → ⁶H_15/2 transition and yellow emission at 576 nm due to ⁴F_9/2→⁶H_13/2 transition. Both the rare-earth doped phosphors showed bright emission.