[en] Full text: Eu³⁺ doped Y₂O₃ nanoparticles were prepared with wet chemical method at low temperature, urea had used as hydrolysis. The prepared nanoparticles are characterized with XRD, FTIR, TEM, the crystalline size determined from XRD are well agreement with the TEM result. The XRD patterns of the core-shell Y₂O₃: Eu-SiO₂ show the core particles are firmly covered. Luminescence studies show that the Eu³⁺ ions lies on the surface of the Y(OH)₃, after annealed at higher temperature Eu³⁺ ions enters the Y³⁺ site. Luminescence emissions show the core-shell nanoparticles show weak luminescence emission intensity but higher efficiency. In overall luminescence emissions, both core and core-shell nanoparticles, the highest luminescence emission can be observed when exited with Eu-O charge transfer peak. Luminescence emission due to the transition ⁵D₀-> ⁷F₁ of Eu³⁺ ions show higher luminescence emission compared to ⁵D₀->⁷F₂