Fabrication and luminescent properties of the core-shell structured YNbO4:Eu/Tb@SiO2 spherical particles |
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| Authors: | Piaoping Yang Zewei Quan Jun Yang Xiaoming Liu |
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| Affiliation: | a State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China
b College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, PR China |
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| Abstract: | The core-shell structured YNbO4:Eu3+/Tb3+@SiO2 particles were realized by coating the YNbO4:Eu3+/Tb3+ 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 YNbO4:Re shell, having perfect spherical morphology with uniform size distribution. Upon excitation by UV or electron beam, these phosphors show the characteristic 5D0-7F1-4 emission lines of Eu3+ and the characteristic 5D4-7F3-6 emission lines of Tb3+. The PL intensities of Eu3+ can be tuned by altering the annealing temperature and the coating number of YNbO4:Eu3+ layers. |
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| Keywords: | Core-shell YNbO4 Luminescence Phosphors Sol-gel |
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