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

Abstract

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 > Ω6. 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.