![]() The core/shell NCs exhibited long fluorescence lifetime and high photostability under ultraviolet radiation. It is well known that YVO 4 belongs to the tetragonal zircon-like structure and Y 3+ is located at a site (D 2d) deviated from an inverse center in the host of YVO 4, which is lead to a charge transfer from the oxygen ligands to the central vanadium atom insides the VO 4 3 group ions. The surface modifications for YVO 4 :Eu NCs effectively reduced the surface defects and accordingly enhanced the luminescence. When Eu3+ ions occupy Y3+ sites, Eu3+ ions are surrounded by eight O2 ions, which is highly asymmetric (D 2d ). In this article, we report the preparation and application of a novel coreshell photocatalyst of bismuth vanadatepolydopamine (BiVO4PDA). Meanwhile, on the basis of laser selective excitation, two kinds of luminescent centers were confirmed in the NCs, namely, inner Eu 3+ ions and surface Eu 3+ ions. Abstract Eu3+ doped in core and shell (YVO4:SiO2) nanoparticles show luminescence peaks corresponding to magnetic and electric dipole transitions of Eu3+. Abstract Highly efficient and reusable photocatalysts that enable photodegradation of pollutants under visible light is the key in waste water treatment with impacts on environment and sustainable development. This is mainly attributed to the formation of the outer protecting layers of biocompatible SiO 2 shells which shield the Eu 3+ ions effectively from water and thus reduces the deleterious effects of water on the luminescence. A remarkable fluorescence enhancement up to 2.17 times was observed in colloidal YVO 4 :Eu/SiO 2 NCs, compared to that of colloidal YVO 4 :Eu NCs. Their morphologies, structures, components, and photoluminescence properties were investigated and presented in this paper. YVO 4 :Eu, and YVO 4 :Eu/SiO 2 nanocrystals (NCs) were prepared by hydrothermal method with citrate as capping ligands. ![]()
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