Luminescence spectra of Eu3+ ions in Y3+-doped CeO2 crystals are measured as a function of excitation wavelength for samples of various Y3+ concentrations. Eu3+ ions, which partially substitute for Y3+ ions, act as a structural probe. It is found that six different sites of Eu3+ ions exist in this material. A local-structure model is proposed for these sites and experimental results are well explained with this model. The dopant-concentration dependence of the luminescence spectra reveals that the defect center of the oxygen vacancy associated with one Y3+ ion is closely related to the ionic conducting mechanism in this sytem.
ASJC Scopus subject areas
- Condensed Matter Physics