Fe₃O₄@Gd₂O₃:Eu^3＋ magnetic and luminescent bi-functional composite particles with core-shell structure were fabricated via a facile hydrothermal method, the structure and properties were characterized. XRD patterns show that the cubic phase Gd₂O₃:Eu^3＋ nanocrystals are coated on the surface of Fe₃O₄ particles after calcined at 700 ℃. TEM images indicate that the obtained composites have obvious core-shell structure and perfect spherical morphology, the diameter of the Fe₃O₄ core is 200～300 nm and the size of the Fe₃O₄@Gd₂O₃:Eu^3＋ composites is about 225～350 nm, the shell thickness of Gd₂O₃:Eu^3＋ ranges from 25 to 50 nm. Compared with Fe₃O₄ core, the size of the coated particles is larger and the surface becomes smoother. Electron diffraction pattern indicates that the sample is polycrystalline. The photoluminescence spectra and the magnetic properties indicate that the core-shell structrual composites have red emitting light and magnetism, which would be potentially applied in biology and medicine fields.

Key words: method, Fe₃O₄, magnetic and luminescent bi-function, core-shell structure