Fig. 1. Absorption spectra and XPS spectra. (a) Absorption spectra of un-doped Si-B glass and Si-B glasses doped with different Sn2+ concentrations; (b) absorption spectra of Si-B glasses with different Gd2O3 concentrations; (c) XPS spectra of Sn1 prepared in CO and air atmospheres; (d) absorption spectra of Sn1 prepared in CO and air atmospheres

Fig. 2. Excitation spectra and emission spectra of un-doped Si-B glass and Si-B glasses doped with different Sn2+ concentrations. (a) Excitation spectra at detection wavelength of 409 nm; (b) emission spectra at excitation wavelength of 252 nm

Fig. 3. Excitation spectra and emission spectra of Si-B glasses with different Gd2O3 concentrations. (a) Excitation spectra at detection wavelength of 409 nm; (b) emission spectra at excitation wavelength of 275 nm

Fig. 4. Absorption spectra and ultraviolet absorption cut-off wavelengths of glass samples doped with different Sn2+ concentrations. (a) Absorption spectra of Si-B glass; (b) absorption spectra of B-Sn glass; (c) absorption spectra of Si-Sn glass;(d) ultraviolet absorption cut-off wavelength of Si-B, B-Sn and Si-Sn glasses

Fig. 5. Luminescence decay curves for different samples. (a) Si-B glasses doped with different Sn2+ concentrations; (b) Si-B glasses with different Gd2O3 concentrations

Fig. 6. Radioluminescence spectra for different samples. (a) Un-doped Si-B glass and Si-B glasses doped with different Sn2+ concentrations; (b) Si-B glasses with different Gd2O3 concentrations

Fig. 7. Energy level diagrams of Gd3+ and Sn2+

Table 1. Compositions and density of Si-B glass

Table 2. Compositions of B-Sn and Si-Sn glasses