放射发光
氧烷
光致发光
荧光粉
材料科学
分析化学(期刊)
吸收边
辐照
发光
热重分析
吸收(声学)
X射线吸收光谱法
兴奋剂
铕
吸收光谱法
差热分析
光谱学
衍射
化学
光学
闪烁体
光电子学
带隙
物理
探测器
量子力学
复合材料
有机化学
核物理学
色谱法
作者
Manassés A. Gomes,Jéssica C. Carvalho,Adriano B. Andrade,Marcos V. dos S. Rezende,Zélia Soares Macedo,Mário E.G. Valério
标识
DOI:10.1016/j.optmat.2017.10.016
摘要
This paper reports structural and luminescence properties of Eu-doped CaAl2O4 produced by an alternative sol-gel method using coconut water. Results of differential thermal analysis (DTA), thermogravimetric analysis (TGA), and X-ray diffraction (XRD) allowed us to identify the best synthesis conditions for sample preparation. Simultaneous measurements of X-ray absorption spectroscopy (XAS) and X-ray excited optical luminescence (XEOL) were also performed in the X-ray energy range of the Eu LIII edge. Results from photoluminescence (PL) showed only the characteristic Eu3+ emission. However, radioluminescence emission spectra from Eu-doped CaAl2O4 shows a process of conversion of Eu3+ to Eu2+, which is induced by X-ray irradiation and is dependent on the radiation dose energy. X-ray absorption near edge structure (XANES) measurements corroborate Eu reduction due to irradiation, showing that only the Eu3+ ion is present in stable form in the CaAl2O4.
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