Physical,structural and optical studies on magnesium borate glasses doped with dysprosium ion

Intense visible emissions from dysprosium (Dy³⁺) ions doped glasses became prospective for diverse technological applications. In this paper, physical, optical and structural properties of magnesium borate glasses doped with varied concentrations of Dy₂O₃ were examined. Such glasses were synthesised by melt quenching method and characterized at room temperature using several analytical techniques. Luminescence and absorption spectra (in the visible region) of as-quenched samples were used to evaluate the physical and optical properties. XRD pattern confims the amorphous state of as-quenched samples. The Fourier transform infrared (FTIR) spectra of glasses reveal various bonding vibrations assigned to different functional groups. UV-vis-NIR spectra disclose eight absorption bands accompanied by a band for hypersensitive transition positioned at 1260 nm (⁶H_15/2 → ⁶F_11/2). The values of direct and indirect optical energy band gap of the studied glasses are decreased with the increase of Dy³⁺ ion contents. The photoluminescence spectra of all glasses under the excitation of 380 nm display two prominent emission bands centred at 497 nm (⁴F_9/2 → ⁶H_15/2, blue) and 587 nm (⁴F_9/2 → ⁶H_13/2, green). The achieved intense luminescence from the proposed glass composition may be beneficial for solid-state laser applications.