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Abstract
Oxyfluoride glasses were developed with composition 30SiO2·15AlO1.5·28PbF2·22CdF2·(4.9 – x)GdF3·0.1HoF3·x YbF3 (x ¼ 0; 0.1, 0.2, 0.5, 1, 2, 3, and 4) in mol%. Powder X-ray diffraction analysis revealed that the heat-treatments of the oxyfluoride glasses at the first crystallization temperature cause the precipitation of Yb3+–Ho3+ co-doped fluorite-type nano-crystals of about 17.8 nm in diameter in the glass matrix. These transparent glass-ceramics exhibited very strong green up-conversion luminescence due to the Ho3+: (5F4, 5S2) → 5I8 transition under 980 nm excitation. The intensity of the green up-conversion luminescence in the glass-ceramics was much stronger than that in the precursor oxyfluoride glass. The reasons for the highly efficient Ho3+ up-conversion luminescence in the oxyfluoride glass-ceramics are discussed.
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