J Y Peter Ko et al 2009 J. Phys.: Conf. Ser. 190 012078 doi:10.1088/1742-6596/190/1/012078
J Y Peter Ko1, Yongfeng Hu2, Lidia Armelao3 and Tsun-Kong Sham1,4
Show affiliationsEuropium-doped calcium tungstate (CaWO4:Eu) was synthesized by a modified Pechini method. X-ray absorption near-edge structure (XANES) and X-ray excited optical luminescence (XEOL) was employed to probe the chemical and luminescence properties of CaWO4:Eu. XANES results demonstrate that the chemical environment around calcium in the doped CaWO4 is similar to that of undoped CaWO4. On the other hand, chemical environment around oxygen is very different. Moreover, the results suggest that contributions to luminescence in the sample are from both silica (from silica matrix) and CaWO4. Using XEOL, luminescence pathways and efficiency associated with the system can be identified.
81.20.Fw Sol-gel processing, precipitation
78.55.Hx Other solid inorganic materials
Issue 1 (2009)
J Y Peter Ko et al 2009 J. Phys.: Conf. Ser. 190 012078
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