Wide-Band Excited YTiTaO₆: Eu³⁺/Er³⁺ Phosphors: Structure Refinement, Luminescence Properties, and Energy Transfer Mechanisms

Eu 3+ -/Er 3+ -activated YTiTaO 6 phosphors have been prepared via conventional solid state reaction process. X-ray diffraction (XRD) and structure refinement, Raman spectra, X-ray photoelectron Spectrum (XPS), photoluminescence (PL) spectra, cathodoluminescence (CL) spectra, and lifetimes were utilized to characterize the synthesized samples. Under UV light excitation, the YTiTaO 6 sample shows broad band emission centered near 505 nm due to the Ta(Ti)O 6 polyhedron. Eu 3+ and Er 3+ ions doped YTiTaO 6 samples show strong line emissions coming from the characteristic f–f transitions. The energy transfer from the Ta(Ti)O 6 group of the host to Eu 3+ and Er 3+ in YTiTaO 6 phosphors has been demonstrated to be a resonant type via a dipole–dipole mechanism, and the critical distance ( R C ) for host emission to Eu 3+ and Er 3+ calculated by concentration quenching method are 10.02 and 18.86 Å, respectively. Under the low voltage electron beam excitation, the CL spectra of YTiTaO 6, YTiTaO 6: Eu 3+, and YTiTaO 6: Er 3+ samples are similar to their PL spectra, exhibiting bluish-green, red, and green luminescence, respectively, which indicates that these materials might be promising for application in solid-state lighting and field-emission displays.