Fabrication and Efficient Infrared-to-Visible Upconversion in Transparent Glass Ceramics of Er–Yb Co-Doped CaF2 Nano-Crystals
Fabrication and Efficient Infrared-to-Visible Upconversion in Transparent Glass Ceramics of Er–Yb Co-Doped CaF2 Nano-Crystals
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DOI：
10.1111/j.1551-2916.2005.00614.x
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发表时间：
2005-12
影响因子：
3.9
通讯作者：
Y. Kishi;S. Tanabe;S. Tochino;G. Pezzotti
中科院分区：
文献类型：
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作者：
Y. Kishi;S. Tanabe;S. Tochino;G. Pezzotti
通过对SiO2-Al 2 O3-CaF 2-LnF 3（Ln=Er，Yb）系统玻璃的热处理，研制了Er-Yb共掺CaF 2纳米晶透明微晶玻璃。随着热处理温度的升高，CaF 2的晶粒尺寸增大。在660和540 nm处的上转换发光强度随着热处理温度的升高而显著增加。阴极发光图谱表明，可见Er发光主要来自沉淀的CaF 2纳米晶体，其声子能量低于硅酸盐基质。结果表明，Er和Yb在CaF 2纳米晶体中得到了富集，陶瓷化后Er ~（3+）发光的量子效率和Yb ~（3+）的能量转移效率得到了显著提高。
Transparent glass ceramics containing CaF2 nano-crystals co-doped with Er–Yb were developed by heat treatment of glasses in the system SiO2–Al2O3–CaF2–LnF3 (Ln=Er, Yb). The crystal size of CaF2 increased with increasing heat-treatment temperature. Upconversion emission intensities at 660 and 540 nm increased dramatically with increasing heat-treatment temperature. The cathode luminescence mapping indicates that the visible Er-luminescence arises mainly from the precipitated CaF2 nano-crystals with a phonon energy lower than that of a silicate matrix. It is concluded that both Er and Yb were concentrated in the CaF2 nano-crystals, and the quantum efficiency of Er3+-luminescence and the energy transfer efficiency from Yb3+ were considerably improved after ceramization.