Luminescence properties and crystallographic sites for Eu~(3+) ions in fluorthalenite Y_3Si_3O_(10)F

摘要

A novel Y_3Si_3O_(10)F:Eu~(3+) phosphor was synthesized under hydrothermal conditions. Luminescence properties and crystallographic sites for Eu~(3+) ions in Y_3Si_3O_(10)F:Eu~(3+) are investigated by site-selective laser-excitation spectroscopy. The three Eu~(3+) centers are identified in the ~7F_o ->~5D_o excitation spectra. The luminescence due to the ~5D_o -> ~7F_j (J= 1, 2) transitions under excitation at each center exhibits its own spectral features and temporal behavior. The crystal-field splitting of the ~7F_1 and ~7F_2 multiplets and intensity ratio of the ~5D_o -> ~7F_2 to ~5D_o -> ~7F_1 emission depend strongly on the crystallographic sites in Y_3Si_3O_(10)F. The decay time of the ~5D_o level is shorter for the site with higher energy. The results are discussed in relation to the site symmetry and the crystal-field strength on Eu~(3+) in the Y_3Si_3O_(10)F lattice.