Abstract
The effect of Mn2+ on the enhancement upconversion (UC) emission and energy transfer of Mn2+/Tb3+/Yb3+ tri-doped SiO2–AlF3–BaF2–TiO2–LaF3 transparent glass-ceramics under excitation 980nm LD were successfully investigated. The UC emission intensity bands centered at 493, 548, 593 and 622nm corresponding to (5D4→7FJ(J=6, 5, 4 and 3)) transitions of Tb3+ were significantly increased with the increase of the Mn2+ concentrations and reaches its maximum at 2.0mol%, then decreases due to the self-quenching effect. Particularly, the UC emission intensity bands centered at 656nm (5D4→7FJ(J=2, 1 and 0)) of Tb3+ was strongly increased about 15-fold with the increase of Mn2+ concentration up to 2.0mol%. The upconversion mechanism and the energy transfer processes from (4T1→6A1) transition of Mn2+ to 5D4→7FJ(J=6, 5, 4, 3, 2, 1 and 0) transitions of Tb3+ were discussed.
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