Photographs of the BNAS10 glass: (a) as prepared, (b) as prepared glass excited by UV lamp, and (c) irradiated glass.
Excitation spectra of unirradiated Sm3+ doped BNAS10 glass in (a) vis and (b) NIR regions.
Emission spectra of unirradiated Sm3+ doped BNAS10, BNAS15, and BNAS20 glasses as a function of SrF2 content in (a) VIS region excited at 401 nm and (b) NIR region excited at 942 nm.
Partial energy level diagram of Sm3+ ions in oxyfluoroborate glass showing various visible and near infrared emissions along with excitation wavelengths. Cross-relaxation (CR) channels are also shown.
γ-irradiated Sm3+doped BNAS10 glass for doses 0.5, 1.0, and 1.5 M Gy. (a) Excitation spectra, emission wavelength at λem = 684 nm of Sm2+ 5D0 7F0 transition. (b) Emission spectra, excited at λex = 377 nm and (c) NIR region, excited at λex = 942 nm.
Intensity ratio of 5D0 7F0 (Sm2+)/4G5/2 6H7/2 (Sm3+) with respect to (a) irradiation dose and (b) SrF2 content.
Comparison of emission spectra of Sm3+ doped glasses for irradiated dose 1.5 M Gy with respect to SrF2 content.
EPR spectra of Sm3+ doped BNAS10 glass (a) 0 M Gy (unirradiated glass), (b) 0.5 M Gy, (c) 1.0 M Gy, (d) 1.5 M Gy, and (e) irradiated glass after heating at 520 °C for 4 h.
Comparison of EPR spectra of Sm3+ doped BNAS10, BNAS15, and BNAS20 glasses at 1.5 M Gy.
EPR signal intensity versus SrF2 content for different g values of Sm3+ doped BNAS10, BNAS15, and BNAS20 glasses irradiated at 1.5 M Gy.
Variation in intensity of EPR signals versus irradiation dose for Sm3+ doped BNAS10 glass.
Decay profile of unirradiated Sm3+ (4G5/2 6H7/2) transition in the oxyfluoroborate glasses with different SrF2 content under excitation at 401 nm.
Decay curves of Sm2+ emission excited at 377 nm, where red line indicates Y-T fitted curves (Eq. (3)), for BNAS10 glass at irradiation doses, 0.5, 1.0, 1.5 M Gy.
Decay curves of Sm2+ emission excited at 377 nm for 1.5 M Gy where red line indicates Y-T fitted curves (Eq. (3)) in BNAS10, BNAS15, and BNAS20 glasses.
Visible (, nm) and NIR peak position (, μm), refractive index (n) of Sm3+ doped BNAS10, BNAS15, and BNAS20 glasses as a function of SrF2 content.
Branching ratio (), effective line width (, nm), stimulated emission cross-section ( × 10−20 cm2), mean lifetime (τ ms), optical gain ( × 10−24), and energy transfer parameter (Q) for transition 4G5/2 6H7/2 in Sm3+ in unirradiated, 4G5/2 6H7/2 in Sm3+ and 5D0 7F0 in Sm2+ ions in irradiated BNAS10, BNAS15, and BNAS20 glasses.
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