Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
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Development and Characterization of $Ln^{3+}$-doped $Gd_2GeO_5$ Phosphors

  • Oh, M.J. (Department of Physics, Kyungpook National University, Department of Radiology, Daegu Heath Colleage) ;
  • Kim, H.J. (Department of Physics, Kyungpook National University) ;
  • Park, H. (Department of Physics, Kyungpook National University) ;
  • Kim, S.H. (Department of Radiological Science, Cheongju University)
  • Received : 2012.12.26
  • Accepted : 2013.06.19
  • Published : 2013.10.15
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Abstract

The $Ln^{3+}$ ($Ln^{3+}=Eu^{3+}$, $Dy^{3+}$, $Tb^{3+}$ or $Sm^{3+}$)-doped $Gd_2GeO_5$ phosphors are produced by using the solid-state reaction. The $Gd_2GeO_5$ has a high effective Z-number ($Z_{eff}=46$) and density ($7.12g/cm^3$) and is sensitive to X-rays. The emission wavelengths of $Ln^{3+}$-doped phosphors are expected adequate for the CCDs. We fabricated $Ln^{3+}$-doped $Gd_2GeO_5$ phosphors and studied their structural and luminescence properties. The $Ln^{3+}$-doped $Gd_2GeO_5$ phosphors were excited by ultraviolet (UV) light, X-rays, and protons. The emission wavelengths were measured to be from 450 nm to 750 nm. The 45-MeV proton beam at the MC-50 cyclotron in the Korea Institute of Radiological and Medical Sciences was used for this purpose. These emission wavelengths matched well with those for a typical CCD. Therefore, $Ln^{3+}$-doped $Gd_2GeO_5$ phosphors are good candidates for use of radiation-imaging phosphors.

Keywords

Acknowledgement

Supported by : National Research Foundation (NRF)

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