Shen Weiying, Lin Jun (Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 , China)
<正> Using CaCO3, metal oxides (all dissolved by nitric acid) and tetraethoxysilane Si(OC2H5)4(TEOS) as the main starting materials, Ca2Y8 (SiO4)6O2: Eu3+ phosphors were synthesized by spray pyrolysis. X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectra as well as lifetimes were used to characterize the resulting phosphors. The results of XRD indicated that the 1000℃annealed powders crystallize with the silicate oxyapatite structure. SEM study revealed that the phosphors consist of spherical particles with an average size of about 1-3 μm. In the crystalline Ca2Y8(SiO4)6O2: Eu3+ phosphor, the Eu3+ shows its characteristic emission corresponding to 5D0-7FJ(J=0,1,2,3,4) transitions, with 5D0-7F2red emission (613 nm) as the most prominent group, agreeing well with the structure of the host material.
silicate oxyapatite; spray pyrolysis; luminescence; europium; spherical phosphor
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