SiO:Tb@LuO:Eu Core-Shell Phosphors: Interfacial Energy Transfer for Enhanced Multicolor Luminescence.

Uniform and well-dispersed SiO:%Tb@LuO:%Eu core-shell spherical phosphors were synthesized via a solvothermal method followed by a subsequent calcination process. The structure, phase composition, and morphology of the samples were studied by X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results showed that the LuO:Eu layer was evenly coated on the surface of SiO:Tb spheres and the shell thickness was about 45-65 nm.