【摘 要】
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The Tb3+ single-doped and Tb3+-Yb3+ co-doped glass ceramics with the precipitation of CaF2, CaF2-SrF2 solid state solution and SrF2 nanocrystals were designed and prepared by taking different amount o
【机 构】
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同济大学材料科学与工程学院,上海,201804
【出 处】
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第七届中国功能玻璃学术研讨会暨新型光电子材料国际论坛
论文部分内容阅读
The Tb3+ single-doped and Tb3+-Yb3+ co-doped glass ceramics with the precipitation of CaF2, CaF2-SrF2 solid state solution and SrF2 nanocrystals were designed and prepared by taking different amount of CaF2 and SrF2 as the starting fluorides to investigate the influence of the crystalline phase on the total quantum efficiency.The formation of the fluoride nanocrystals and the incorporation of the doped rare earth ions into the fluoride nanocrystals were proved by the XRD measurement.The energy transfer from Tb3+ to Yb3+ was studied by the steady and time resolved spectra.The total internal quantum efficiencies were calculated based on the measured Tb3+ lifetime, which is about 10.5% improved in the SrF2 nanocrystals precipitated glass ceramics compared to the CaF2 nanocrystals precipitated glass ceramics mainly due to the lower phonon energy environment.Meanwhile, the total external quantum efficiencies were evaluated with the integrating sphere measurement system, which are 18.6%, 19.3% and 24.4%,respectively, for the CaF2, CaF2-SrF2 and SrF2 nanocrystals precipitated glass ceramics.Additionally, the obvious difference between the calculated total internal quantum efficiency and the measured total external quantum efficiency was also discussed.
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