The luminescence properties of Eu3+ ions in yttria-stabilized zirconia crystals are studied on samples with various yttria concentrations by using site-selective spectroscopy. From the analysis of luminescence spectra excited by ultraviolet light, it is found that the average crystal-field strength which acts on the Eu3+ ions increases with increasing dopant concentration. A detailed analysis of the site-selective spectra reveals that three distinct, but very similar sites for Eu3+ ions exist and, furthermore, the existence ratio of each site continuously changes with increasing dopant concentration. We propose local-structure models around the Eu3+ ions and discuss the relationship between local structures and ionic conductivity in this system.
ASJC Scopus subject areas
- Condensed Matter Physics