Synthesis and characterization of Eu3+-doped C12H18Ca3O18 phosphor

A series of Eu3+-doped C12H18Ca3O18 phosphors were synthesized through a facile hydrothermal method and the properties of as-prepared phosphors were explored by X-ray diffractometer (XRD), scanning electron microscope (SEM), and photoluminescence (PL) spectrometer. The exploration results indicated that the C12H18Ca3O18:Eu3+ had been successfully synthesized. The morphology of C12H18Ca3O18:Eu3+ was a strip with the size of 100-4000 nm x 50-400 nm x 50-200 nm and the ratio of length to width of 2-80. The strongest emission peak of C12H18Ca3O18:Eu3+ around 620 nm was ascribed to D-5(o)-> F-7(2) transition of Eu3+, and the peaks centered at 590, 653 and 694 nm respectively corresponded to D-5(o)-> F-7(1), F-7(3), and F-7(4) transitions. C12H18Ca3O18: Eu3+ gave the red light emission, as indicated by color coordinate analysis. The photoluminescence intensity of the phosphors prepared under the Eu3+ concentration of 6% was the highest. The crystal structure of Ci(2)H(18)Ca(3)O(18):Eu3+ was changed after europium ions occupied the lattice position of calcium ions. Europium ion could displace calcium arbitrarily. As a new kind of matrix, calcium citrate possesses the properties of both organic and inorganic compounds and the luminescent C12H18Ca3O18: x Eu3+ particles may be applied in biological fluorescent tags and luminescent materials.