Preparation And Properties Of Ag@Yf3:Eu3+ Core-Shell Structural Nanomaterials

Ag nanoparticles were successfully synthesized with a high yield by a polyol process, and the uniform spherical Ag@YF3:Eu3+ core-shell structural nanomaterials were fabricated via a facile direct precipitation method, then the structure and properties were characterized. XRD patterns show that the orthogonal phase YF3:Eu3+ nanocrystals are coated on the surface of Ag cores. TEM images indicate that the obtained composites have obvious core-shell structure and uniform spherical morphology, the diameter of the Ag core is of 80 similar to 100 nm, the size of the Ag@YF3:Eu3+ composite is about 150 similar to 180 nm, the surface is rough and the coating is complete. Electron diffraction pattern indicates that the samples are polycrystalline. The photoluminescence spectra indicate that the core-shell structural composites have good luminescence, the strong emission peak is near 593 nm corresponding to D-5(0)-> F-7(1) magnetic dipole transition of Eu3+, the fluorescent intensity is weaker but the lifetime is stronger than that of the pure YF3:Eu3+, which indicates that the fluorescent of YF3:Eu3+ is quenched by Ag cores.