The SiO₂ submicron particles coated with an yttrium aluminum garnet (Y₃Al₅O₁₂, YAG) layer doped with Tb³⁺ were prepared by the sol-gel method. The morphology and structure of samples determined by the X-ray powder diffraction (XRD) measurements and transmission electron microscope (TEM) images, respectively, indicated that well-crystallized nanocrystallites were form the evolution of luminescence properties. The effect of coating was analyzed by comparing properties of the Tb³⁺:Y₃Al₅O₁₂ nanocrystalline powders and composite Tb³⁺:Y₃Al₅O₁₂/SiO₂ materials. A possible applications of obtained structures is discussed in this work.

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