Photoluminescence and gamma ray shielding properties of novel Dy3+: GSBS glass for solid state W-LEDs and radiation applications

A novel dysprosium doped gadolinium strontium borosilicate (Dy3+: GSBS) glass with luminescence and radiation shielding properties was prepared with conventional melt quenching method, of which composition was [(55-x) H3BO3 + 15 SiO2 + 5 Gd2O3 + 10 SrCO3 + 10 CdF2 + 5 TiO2 + x Dy2O3 (where x = 0.05, 0.3, 0.5, 1, 2 and 3 in wt. %, hereafter refers to as Dy3+ ions concentration)]. And it was characterized through X-ray diffraction (XRD), visible absorption, excitation, photoluminescence, decay time measurements and Phy-X/PSD program. Its aperiodic nature was confirmed by XRD patterns. The density and refractive index increase with the increase of Dy3+ ions concentration. The optical basicity (Lambda(th)), the optical packing density, the average molecular weight (g), the optical electro-negativity (chi), the boron-boron distance (d(B)-d(B)) and the steepness parameter (S) were measured. The Nephelauxetic ratio (beta) and the bonding parameter (delta) reveal that the (Dy-O) glass are covalent in nature. The oscillator strength and Judd-Ofelt (J-O) intensity parameters were calculated and then were used to predict some radiative properties, such as the transition probability (A), the stimulated emission cross-section (sigma(E)(P)) and the branching ratios (beta(R)) for each glass. The colour coordinates (x, y) and (u, v), the colour purity (CP), the colour correlated temperature (CCT), and the yellow to blue ratio (Y/B) were also articulated. The prepared glasses are positioned in the white region of the CIE diagram. The glass expressed the non-exponential behaviour, and IH model was adopted to analyse the dipole-dipole interaction between Dy3+ and Dy3+ ions. 1DyGSBS glass has higher values of the stimulation of white light parameter, the stimulated emission cross-section (sigma(E)(P)), and the gain bandwidth (sigma(E)(P) x Delta lambda(eff)) than the others. Furthermore, the gamma ray parameters, such as the mass attenuation coefficient (mu/rho), the half and tenth value layers, the effective atomic number, the equivalent atomic number, the exposure and energy absorption buildup factors (EBF and EABF), and the fast neutron removal cross-section (Sigma(R)) were analysed with Phy-X/PSD program. According to the outcomes of the present work, it is perceptible that these glasses, especially 1DyGSBS and 3DyGSBS, are great potential in white lighting and gamma ray shielding applications for the future.