The Research of Ce³⁺-doped Lu₂Gd₁Ga₂Al₃O₁₂ Phosphor for X-ray Imaging

Ce³⁺-doped Lu2Gd1Ga2Al3O12 phosphor is fabricated by solid-state reaction method using an electric furnace at 1500 ^◦C for 12 hours and measured by an X-ray diffractometer (XRD) and a field emission scanning electron microscope (FE-SEM) to confirm the crystalline structure. The luminescence properties for UV and X-ray is investigated using X-ray and UV sources, respectively. The emission wavelength of the Ce³⁺-doped Lu2Gd1Ga2Al3O12 phosphor for UV and X-ray is confirmed at 525 nm because of ²D_5/2 to ²F_5/2 transition. This wavelength is coincident with yellow color in the CIE chromaticity diagram. The rare earth element-containing phosphors have a high absorption efficiency for X-ray and gamma-ray because of their high atomic Z numbers (Z_eff = 55); therefore, they have an advantage for medical imaging fields using X-ray and gamma-ray.