Spectroscopic properties and Judd-Ofelt analysis of Dy³⁺ ions in molybdenum borosilicate glasses

Borosilicate glasses containing MoO₃ and Dy₂O₃ were prepared by the melt quenching technique. The structure and the thermal properties of these glasses have been performed by using infrared (IR) technique at room temperature and DTA. The mechanical properties have been experimentally determined and calculated according to Makishima–Mackenzie model. The optical properties of the prepared glasses have been studied using the UV – Spectroscopy. The glass transition temperature and the optical band gap decrease with increasing the MoO₃ content. The values of the optical band gap lie between 2.25–3.22 eV. The optical properties of the Dy³⁺ ion have been investigated using the Judd-Ofelt approach. The oscillator strengths and optical intensity parameters, Ω_t = 2, 4 and 6 have been evaluated. An interesting behavior of the calculated lifetime versus total angular momentum, J, has been observed, where, the lifetime values of the ⁶F_J states show an exponential increase versus J.