Silica Supported Submicron SiO2@Y2SiO5:Eu3+ and SiO2@Y2SiO5:Ce3+/Tb3+ Spherical Particles with a Core–Shell Structure: Sol–Gel Synthesis and Characterization
作者： Cuikun Lin , Huan Wang , Deyan Kong , Min Yu , Xiaoming Liu
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摘要: X-1-y(2)SiO(5):Eu3+ and X-1-Y2SiO5:Ce3+ and/or Tb3+ phosphor layers have been coated on nonaggregated, monodisperse, submicron spherical SiO2 particles by a sol-gel process, followed surface reaction at high temperature (1000 degrees C), to give core/shell structured SiO2@Y2SiO5:Eu3+ SiO2@Y2SiO5:Ce3+/Tb3+ particles. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), TEM, photoluminescence (PL), low voltage cathodoluminescence (CL), time-resolved PL spectra lifetimes are used characterize these materials. The XRD results indicate that X-1-Y2SiO5 successfully the sur- face Of particles, as further verified FESEM TEM images. CL studies suggest SiO2@Y2SiO5:Eu3+, SiO2@Y2SiO5:Tb3+ (or Ce3+/Tb3+), SiO2@Y2SiO5:Ce3+ exhibit red (Eu3+, 613 rim: D-5(0)-F-7(2)), green (Tb3+, 542nm: D-5(4)-F-7(5)), or blue (Ce3+, 450nm: 5d-4f) luminescence, respectively. Pl, excitation, emission, demonstrate there is an energy transfer from Ce3+ in SiO2@Y2SiO5:Ce3+,Tb3+
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