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Sol-gel preparation and characterization of uniform core-shell structured LaInO3:Sm/Tb@SiO2 phosphors |
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| Authors: | Yongchen ShangPiaoping Yang Wenxin WangYanli Wang Na NiuShili Gai Jun Lin |
| Affiliation: | a College of Chemistry, Harbin Normal University, Harbin 150025, PR China b College of Material Science and Chemical Engineering, Harbin Engineering University, 145 Nantong Street, Harbin 150001, PR China c State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China |
| Abstract: | The core-shell structured LaInO3:Ln3+@SiO2 (Ln3+ = Sm3+, Tb3+) phosphors were realized by coating LaInO3:Ln3+ phosphors on the surface of silica microspheres via a modified Pechini sol-gel process. The phase, structure, morphology, and fluorescent properties of the materials were well 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, cathodoluminescence (CL) spectra, and the kinetic decays, respectively. The results reveal that the obtained core-shell structured phosphors consist of amorphous silica core and crystalline LaInO3:Ln3+ shell, which keep the uniform spherical morphology of pure silica spheres with narrow size distribution. Upon excitation by ultraviolet (UV) irradiation or electron beam, the phosphors show the characteristic emission lines of Sm3+ (4G5/2-6H5/2,7/2,9/2, orange) in LaInO3:Sm3+@SiO2 and characteristic emissions of Tb3+ (5D4-7F6,5,4,3, green) in LaInO3:Tb3+@SiO2, respectively. This kind of phosphors may have potential applications in field emission displays (FEDs) based on their uniform shape, low-cost synthetic route, and diverse luminescent properties. |
| Keywords: | Core-shell LaInO3 Luminescence Phosphors Sol-gel synthesis |
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