Study of the luminescence Properties of Dy³⁺or Sm³⁺doped Lu₂Gd₁Ga₂Al₃O₁₂Phosphors for X-ray Imaging

In this study, the Lu₂Gd₁Ga₂Al₃O₁₂phosphor was fabricated using the solid-state reaction method, and its luminescence characteristics were studied. To confirm the crystallinity and the grain size of the Lu₂Gd₁Ga₂Al₃O₁₂phosphor, an X-ray difraction (XRD) and FE-SEM was measured . The emission spectra of the Lu₂Gd₁Ga₂Al₃O₁₂phosphor was measured using X-ray and UV light sources. The results comfirmed that the main peaks of Lu₂Gd₁Ga₂Al₃O₁₂:Sm³⁺and Lu₂Gd₁Ga₂Al₃O₁₂:Dy³⁺were between 550 to 750 nm and 450 to 800 nm, respectively. Lastly, the decay time was measured and compared to Lu₂Gd₁Ga₂Al₃O₁₂:Sm³⁺and Lu₂Gd₁Ga₂Al₃O₁₂:Dy³⁺phosphor. The luminescence spectra result of the X-ray was coincident to UV light sources. The Lu₂Gd₁Ga₂Al₃O₁₂phosphor is composed of rare earth elements such as Gd₂O₃and Lu₂O₃, which have a high effective atomic Z numbers (Z_eff= 55) and high detection efficiency for X-rays and gamma rays. Therefore, phosphar can be applied in fields of medical diagnostic imaging.