Abstract
A novel polychromic phosphor with core–shell heteronanostructure has beenprepared to improve the chromatic index of phosphors. As for the first example,Y2O3:Eu3+@SiO2@YVO4:Eu3+, its synthetic route, structure and optical properties are presented in this paper. X-raydiffraction (XRD), field emission scanning electron microscopy (FE-SEM), high resolutiontransmission electron microscopy (HR-TEM), energy-dispersive x-ray spectra (EDS)and photoluminescence (PL) were all employed to characterize the compositecore–shell phosphors. The XRD, FE-SEM and HR-TEM results indicate that theSiO2 andYVO4:Eu3+ layers have beensuccessfully coated on Y2O3:Eu3+ nanoparticles and SiO2 layer, respectively: these layers were further verified by the EDS. The PL showed that the red-emittingphosphor Y2O3:Eu3+@SiO2@YVO4:Eu3+ possessed the independent luminescent properties of both the coreY2O3:Eu3+ and theshell YVO4:Eu3+. The emissions were dominated by or transitions of Eu3+ when excited with different wavelengths. Since this broad-band response to excitation in the rangeof 225–340 nm gave more red/dark red emissions found at 612, 616 and 620 nm, the novel phosphorY2O3:Eu3+@SiO2@YVO4:Eu3+ could have potential biological labeling applications with wide flexibility.
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