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首页> 外文期刊>Journal of nanoscience and nanotechnology >Rare-earth containing nanocrystal precipitation and up-conversion luminescence in oxyfluoride glasses
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Rare-earth containing nanocrystal precipitation and up-conversion luminescence in oxyfluoride glasses

机译：氟氧化物玻璃中含有稀土元素的纳米晶体沉淀和上转换发光

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摘要

Rare-earth ion doped oxyfluoride glass with a composition of 25SiO(2) center dot 5GeO(2) center dot 15AlO(1.5) center dot 40PbF(2) center dot 10PbO center dot (4.9 - x)GdF3 center dot 0.1 HoF3 center dot xYbF(3) (x = 0, 0.1, 0.2, 0.5,1, 2, 3, and 4) in molar ratio was developed. When the oxyfluoride glasses are heat-treated at the first crystallization temperature, the glasses give transparent glass-ceramics in which rare-earth-containing fluorite-type nanocrystals of about 17.2 nm in diameter uniformly precipitated in the glass matrix. Comparing with the glasses before heat treatment, the glass ceramics exhibit very strong up-conversion luminescence under 980-nm light excitation. Rare-earth-containing nanocrystals were also space selectively precipitated upon laser irradiation in an oxyfluoride glass; the size of precipitated nanocrystals can be controlled by laser power and scan speed. The intensity of the green up-conversion luminescence is strongly dependent on the precipitation of beta-PbF2 nanocrystals and the YbF3 concentration. The reasons for the highly efficient Ho3+ up-conversion luminescence are discussed.
机译：稀土离子掺杂的氟氧化物玻璃，其成分为25SiO（2）中心点5GeO（2）中心点15AlO（1.5）中心点40PbF（2）中心点10PbO中心点（4.9-x）GdF3中心点0.1 HoF3中心点形成了摩尔比为xYbF（3）（x = 0、0.1、0.2、0.5、1、2、3和4）的化合物。当在第一结晶温度下对氟氧化物玻璃进行热处理时，该玻璃产生透明的玻璃陶瓷，其中直径约17.2nm的含稀土的萤石型纳米晶体均匀地沉淀在玻璃基质中。与热处理之前的玻璃相比，玻璃陶瓷在980 nm的光激发下表现出非常强的上转换发光。含稀土的纳米晶体在氟氧化物玻璃中通过激光辐照也选择性地在空间上沉淀。沉淀的纳米晶体的大小可以通过激光功率和扫描速度来控制。绿色上转换发光的强度强烈依赖于β-PbF2纳米晶体的沉淀和YbF3的浓度。讨论了高效Ho3 +上转换发光的原因。

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