A new compound, Tb2Te4O11, with monoclinic symmetry was synthesized by the solid-state reaction of TeO2 and Tb4O7 in the temperature range 700-800°C in air. Its lattice parameters were calculated to be a = 12.54 Å, b = 5.124 Å, c = 16.08 Å, and β = 106.08°. On heating at 800°C for a long time, the compound gradually changed its chemical formula to Tb2Te4-yO11-2y (y ≤ 0.25) without any structural changes. Also, solid solutions of (Y1-xTbx)2Te4O11 were synthesized in the range 0.01 ≤ x ≤ 1.0. When the amount of Tb3+ increased, the 5D4 emission became intense, whereas the 5D3 emission was quenched by cross-relaxation. Such fluorescence profiles were examined and discussed to provide an understanding of the energy transfer process with respect to the concentration of Tb3+ ion.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry