Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Synthesis and Characterization of Spherical SiO2@Y2O3 : Eu Core-Shell Composite Phosphors

구형 SiO2@Y2O3: Eu 코어-쉘 복합체 형광체 합성 및 특성

  • Song, Woo-Seuk (Department of Materials Science and Engineering, Hongik University) ;
  • Yang, Hee-Sun (Department of Materials Science and Engineering, Hongik University)
  • 송우석 (홍익대학교 신소재공학과) ;
  • 양희선 (홍익대학교 신소재공학과)
  • Received : 2011.07.29
  • Accepted : 2011.08.17
  • Published : 2011.09.30
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Abstract

The monodisperse spherical $SiO_2$ particles were overcoated with $Y_2O_3:Eu^{3+}$ phosphor layers via a Pechini sol-gel process and the resulting $SiO_2@Y_2O_3:Eu^{3+}$ core-shell phosphors were subsequently annealed at $800^{\circ}C$ at an ambient atmosphere. The crystallographic structure, morphology, and luminescent property of core-shell structured $SiO_2@Y_2O_3:Eu^{3+}$ phosphors were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and photoluminescence (PL). The spherical, nonagglomerated $SiO_2$ particles prepared by a Stober method exhibited a relatively narrow size distribution in the range of 260-300 nm. The thickness of phosphor shell layer in the core-shell particles can be facilely controlled by varying the coating number of $Y_2O_3:Eu^{3+}$ phosphors. The core-shell structured $SiO_2@Y_2O_3:Eu^{3+}$ phosphors showed a strong red emission, which was dominated by the $^5D_0-^7F_2$ transition (610 nm) of $Eu^{3+}$ ion under the ultraviolet excitation (263 nm). The PL emission properties of $SiO_2@Y_2O_3:Eu^{3+}$ phosphors were also compared with pure $Y_2O_3:Eu^{3+}$ nanophosphors.

Keywords

References

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