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首页> 外文期刊>Japanese Journal of Applied Physics. Part 2, Letters >Formation of Eu~(2+) in SiO_2-Al_2O_3 Glass During Thermal Treatment in Sol-Gel Process
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Formation of Eu~(2+) in SiO_2-Al_2O_3 Glass During Thermal Treatment in Sol-Gel Process

机译：溶胶-凝胶法热处理SiO_2-Al_2O_3玻璃中Eu〜（2+）的形成

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摘要

Although the Eu ion in a glass matrix is most stable in its trivalent form Eu~(3+), we found that a distinct blue photoluminescence (PL) from Eu~(2+) in Eu-doped SiO_2-Al_2O_3 glasses was obtained without any deoxidizing treatments after a conventional sol-gel process. The incorporation of Al in a correct proportion to the concentration of Eu is essential for stabilizing Eu~(2+) during thermal treatment in the process. In order to understand the effect of the thermal treatment, we combined the result of thermal analysis with that of PL as a function of heating temperature. The PL spectral change from the defect-originated emission to the blue emission due to Eu~(2+) occurred at the temperature between 400℃ and 600℃. An exothermic peak was observed at 450℃ using our differential scanning calorimeter. We concluded that the reduction of Eu~(3+) and the stabilization of the resultant Eu~(2+) in the glass network takes place at the temperature around 450℃.
机译：尽管玻璃基体中的Eu离子以其三价形式Eu〜（3+）最稳定，但我们发现在Eu掺杂的SiO_2-Al_2O_3玻璃中，Eu〜（2+）具有明显的蓝色光致发光（PL）。在常规的溶胶-凝胶工艺之后进行的任何脱氧处理。以与Eu的浓度成正比的方式掺入Al，对于稳定过程中的Eu〜（2+）至关重要。为了了解热处理的效果，我们将热分析的结果与PL的分析结果结合起来，作为加热温度的函数。 Eu〜（2+）引起的PL从缺陷源发射到蓝色发射的光谱变化发生在400〜600℃之间。使用差示扫描量热仪在450℃观察到放热峰。我们得出结论，玻璃网络中Eu〜（3+）的还原和所得Eu〜（2+）的稳定发生在450℃左右的温度下。

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