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The preparation process and upconversion luminescence properties of the
Yb^3^+ and Tm^3^+ co-doped glass ceramic containing SrF"2 nanocrystals were
investigated. In the glass ceramic, the SrF"2 nanocrystals were embedded
uniformly in the glass matrix. The Yb^3^+ and Tm^3^+ ions could be enriched
into the precipitated SrF"2 nanocrystalline phase, which provide much lower
phonon energy than the glass matrix. The glass ceramic exhibited much
stronger upconversion luminescence from ultraviolet to visible than the
precursor glass. The upconversion luminescence mechanisms were mainly
attributed to Yb^3^+-Yb^3^+ cooperative upconversion, Yb^3^+-Tm^3^+ energy
transfer and Tm^3^+-Tm^3^+ cross relaxation.
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