Synthesis and luminescent properties of Gd₃Ga₂Al₃O₁₂ phosphors doped with Eu³⁺ or Ce³⁺

Eu³⁺-or Ce³⁺-doped gadolinium gallium aluminum garnet (GGAG), Gd₃Ga₂Al₃O₁₂, phosphors are fabricated using solid-state reactions with Gd₂O₃, Ga₂O₃, Al₂O₃, CeO₂ and Eu₂O₃ powders. The Eu³⁺-or Ce³⁺-doped Gd₃Ga₂Al₃O₁₂ phosphors are sintered at 1300 °C or 1600 °C for 5 hours by using an electric furnace under normal atmosphere. X-ray diffraction and field-emission scanning electron microscopy studies are carried out in order to analyze the physical properties of these materials, and their luminescence properties are also measured by using UV and X-ray sources. The Eu³⁺-or Ce³⁺-doped Gd₃Ga₂Al₃O₁₂ phosphors show higher light yields in comparison to commercial phosphors such as Gd₂O₂S:Tb (gadox). This indicates that Gd₃Ga₂Al₃O₁₂:Eu³⁺ phosphors are promising materials for use in X-ray imaging and dose monitoring at proton beamlines.