Synthesis and photoluminescence of core-shell structured spherical SiO2@YPO4:Tb3+ phosphors via sol-gel process

. ► Monodispersed SiO2@YPO4. ► Tb3+ core-shell submicrospheres prepared by a simply homogeneous sol-gel method have the regular microstructures and exhibit the green emission of Tb3+. ► The emission intensities of Tb3+ increase with increasing the annealing temperatures and the number of coating cycles.