Optical, emission, and excitation dynamics of Eu 3+ -doped bismuth-based phosphate glass for visible display laser applications.

Eu 3+ -doped-bismuth-based phosphate glasses with chemical equation (60 - x)P 2 O 5 -20Bi 2 O 3 -10Na 2 CO 3 -10SrF 2 -xEu 2 O 3 (PBNSEu), (where x = 0, 0.1, 0.5, 1.0, 1.5 and 2 mol%) were fabricated using the melt-quenching method. Obtain X-ray diffraction (XRD), energy-dispersive X-ray (EDAX), and Fourier transform infrared (FTIR) spectra were used to characterize the structure of the prepared PBNSEu glass. The J-O (Judd-Ofelt) intensity parameters (Ω 2 , Ω 4 ) were estimated using photoluminescence emission spectra. When excited with a xenon lamp at λ exc  = 394 nm, the most intense red-emission transition occurred at ~612 nm ( 5 D 0 → 7 F 2 ). J-O intensity parameters were used to calculate radiative properties, whereas the radiative branching ratio (β R ), radiative transition probability (A R ), radiative lifetime (τ R ), and total radiative transition rate (A τ ) were calculated for the transitions 5 D 0 → 7 F J (where J = 0-4) and were obtained in the emission spectra for europium ion-doped in the current glass. Using the CIE1931 chromaticity coordinates axes, the colours of various concentrations of Eu 3+ ion-doped PBNS glass were evaluated using the emission spectra. Temperature-dependent luminescence spectra were recorded for the optimized PBNSEu20 glass to calculate the activation energy. These results strongly suggested red components in w-LEDs and visible display laser applications.