Abstract
The core–shell structured YNbO 4:Eu 3+/Tb 3+@SiO 2 particles were realized by coating the YNbO 4:Eu 3+/Tb 3+ phosphors onto the surface of spherical silica via a sol–gel process. The obtained materials were characterized by means of X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Fourier transform IR spectroscopy (FT-IR), photoluminescence (PL) spectra, and cathodoluminescence (CL) spectra. The results indicate that 600 °C annealed samples consist of amorphous silica core and crystalline YNbO 4:Re shell, having perfect spherical morphology with uniform size distribution. Upon excitation by UV or electron beam, these phosphors show the characteristic 5 D 0– 7 F 1–4 emission lines of Eu 3+ and the characteristic 5 D 4– 7 F 3–6 emission lines of Tb 3+. The PL intensities of Eu 3+ can be tuned by altering the annealing temperature and the coating number of YNbO 4:Eu 3+ layers.
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