LAUSR

Sm3+ or Tb3+ -doped Lu3Ga2Al3O12 phosphors were synthesized by using a solid-state reaction method with Lutetium oxide, gallium oxide and aluminum oxide as host materials, samarium oxide and terbium oxide as doping materials. The mixed powders were sintered at 1500 °C for 5 hours by using a horizontal furnace. In this study, the structures of Sm3+ or Tb3+ -doped Lu3Ga2Al3O12 phosphors were observed using an XRD (X-ray diffraction). The emission spectrum of Sm3+ -doped Lu3Ga2Al3O12 phosphor shows 550–650 nm in wavelength due to 4Gj to 6Hj. The measurement of emission spectrum of Tb3+ -doped Lu3Ga2Al3O12 phosphor was confirmed to 450 to 650 nm wavelength due to 5Dj to 7Fj. These phosphors have a sharp emission spectrum due to their physical properties of f-f transition. The Lu3Ga2Al3O12 has a high effective Z-number (Zeff = 57) which is sensitive to X-ray or γ-ray. Therefore Sm3+ or Tb3+ -doped Lu3Ga2Al3O12 phosphors can be applied for diagnostic X-ray imaging in the medical field.