Abstract
In this thesis, we discuss the relationship between the changes of perovskite structure of europium-doped Ca(Ti,Zr)O3 and its fluorescence properties. Europium-doped Ca(Ti,Zr)O3 were prepared by a sol-gel method and annealed at 800°C in O2. The structure and particle size were investigated by X-ray powder diffraction (XRD). The XRD results show that the particle size is dependent on the Ti/Zr ratio. The extended x-ray absorption fine structure results show that Zr and Ti are in similar chemical environments. The Eu L3-edge EXAFS result exhibits reduced symmetry when Zr dopant atoms are present in the CaTiO3 host structure. Photoluminescence measurements show that the fluorescence intensity increases with the asymmetry of local environment surrounding Eu3+.