Sol-gel synthesis and photoluminescence properties of BaSO_4/Y_2O_3:Eu~(3+) core-shell submicrospheres
来源期刊：JOURNAL OF RARE EARTHS2009年第6期
论文作者：HU Qiyang WANG Zhixing LI Jinhui LI Xinhai ZHANG Ming LIU Wanrong
Key words：phosphor; sol-gel; core-shell; photoluminescence; rare earths;
Abstract: Europium-doped nanocrystalline Y_2O_3 phosphor layers were coated on the surface of preformed submicron BaSO_4 spheres via the sol-gel process. The obtained BaSO_4/Y_2O_3:Eu~(3+) core-shell phosphors were characterized by X-ray diffraction (XRD), scanning electron mi-croscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) and photoluminescence spectra. The re-suits showed that the obtained BaSO_4/Y_2O_3:Eu~(3+) core-shell phosphors consisted of well-dispersed submicron spherical particles with narrow size distribution and non-agglomeration. TEM and EDS results showed that BaSO_4 particles were well coated with the shell of Y_2O_3:Eu~(3+).XRD result demonstrated that no reaction occurred between the BaSO_4 cores and the Y_2O_3:Eu~(3+) shells even after annealing at 1200 ℃. The BaSO_4/ Y_2O_3:Eu~(3+) core-shell particles showed a red emission corresponding to ~5Do-~7F_2 of Eu~(3+) under the excitation of ultraviolet.
HU Qiyang1，WANG Zhixing1，LI Jinhui1，LI Xinhai1，ZHANG Ming1，LIU Wanrong1
(1.School of Metallurgical Science and Engineering,Central South University,Changsha 410083,China)
Abstract:Europium-doped nanocrystalline Y_2O_3 phosphor layers were coated on the surface of preformed submicron BaSO_4 spheres via the sol-gel process. The obtained BaSO_4/Y_2O_3:Eu~(3+) core-shell phosphors were characterized by X-ray diffraction (XRD), scanning electron mi-croscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) and photoluminescence spectra. The re-suits showed that the obtained BaSO_4/Y_2O_3:Eu~(3+) core-shell phosphors consisted of well-dispersed submicron spherical particles with narrow size distribution and non-agglomeration. TEM and EDS results showed that BaSO_4 particles were well coated with the shell of Y_2O_3:Eu~(3+).XRD result demonstrated that no reaction occurred between the BaSO_4 cores and the Y_2O_3:Eu~(3+) shells even after annealing at 1200 ℃. The BaSO_4/ Y_2O_3:Eu~(3+) core-shell particles showed a red emission corresponding to ~5Do-~7F_2 of Eu~(3+) under the excitation of ultraviolet.
Key words:phosphor; sol-gel; core-shell; photoluminescence; rare earths;
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