Luminescence, spectroscopic properties and reddish-orange emission from Eu³⁺ ion doped tellurite and fluorotellurite glasses: A comparative study

In this study, the properties of tellurite (TeEu) glass and fluorotellurite (FTeEu) were compared with the addition of 2 mol% of europium. The chemical compositions of the samples were prepared by two formulars: 53TeO₂-10ZnO-35BaO-2Eu₂O₃ (TeEu) and 53TeO₂-10ZnF₂-35BaO-2Eu₂O₃ (FTeEu) which were prepared by glass casting technique. The results showed that the molar volume and refractive index of the FTeEu sample were higher than TeEu, with values 29.0553 cm³/mol and 1.806, respectively. Measuring the UV–VIS–NIR absorption spectra with a proven measured in air atmosphere in the range of 200–2500 nm demonstrated an extension of intensity of absorption bands with ZnF₂ contents increased. The spectroscopic studies consisted of two main themes: Judd-Ofelt and phonon side-band analyses. The results of the Phonon Side Band (PSB) spectral assays associated with the ⁷F₀→⁵D₂ transition of the Eu³⁺ ion showed that the phonon energy of the FTeEu sample was lower than TeEu, with value 667 cm⁻¹. The relationship of the JO intensity parameter of the FTeEu sample is on the Ω₂ > Ω₄ > Ω_6. The decay time and CIE coordinates, had calculated for prepared glass samples. In view of the results of our study, the FTeEu samples is a more suitable choice for reddish -orange laser materials, telecommunication applications and optical device applications.