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Fluorescence properties and electron paramagnetic resonance studies of γ-irradiated Sm3+-doped oxyfluoroborate glasses
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10.1063/1.4764043
/content/aip/journal/jap/112/9/10.1063/1.4764043
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/9/10.1063/1.4764043

Figures

Image of FIG. 1.
FIG. 1.

Photographs of the BNAS10 glass: (a) as prepared, (b) as prepared glass excited by UV lamp, and (c) irradiated glass.

Image of FIG. 2.
FIG. 2.

Excitation spectra of unirradiated Sm3+ doped BNAS10 glass in (a) vis and (b) NIR regions.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

Intensity ratio of 5D0 7F0 (Sm2+)/4G5/2 6H7/2 (Sm3+) with respect to (a) irradiation dose and (b) SrF2 content.

Image of FIG. 7.
FIG. 7.

Comparison of emission spectra of Sm3+ doped glasses for irradiated dose 1.5 M Gy with respect to SrF2 content.

Image of FIG. 8.
FIG. 8.

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.

Image of FIG. 9.
FIG. 9.

Comparison of EPR spectra of Sm3+ doped BNAS10, BNAS15, and BNAS20 glasses at 1.5 M Gy.

Image of FIG. 10.
FIG. 10.

EPR signal intensity versus SrF2 content for different g values of Sm3+ doped BNAS10, BNAS15, and BNAS20 glasses irradiated at 1.5 M Gy.

Image of FIG. 11.
FIG. 11.

Variation in intensity of EPR signals versus irradiation dose for Sm3+ doped BNAS10 glass.

Image of FIG. 12.
FIG. 12.

Decay profile of unirradiated Sm3+ (4G5/2 6H7/2) transition in the oxyfluoroborate glasses with different SrF2 content under excitation at 401 nm.

Image of FIG. 13.
FIG. 13.

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.

Image of FIG. 14.
FIG. 14.

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.

Tables

Generic image for table
Table I.

Visible (, nm) and NIR peak position (, μm), refractive index (n) of Sm3+ doped BNAS10, BNAS15, and BNAS20 glasses as a function of SrF2 content.

Generic image for table
Table II.

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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/content/aip/journal/jap/112/9/10.1063/1.4764043
2012-11-08
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Fluorescence properties and electron paramagnetic resonance studies of γ-irradiated Sm3+-doped oxyfluoroborate glasses
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/9/10.1063/1.4764043
10.1063/1.4764043
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