Cross-sensitization of Ce³⁺ and Tb³⁺ luminescence in (Gd, Y)₃Al₂Ga₃O₁₂ scintillation ceramics

Crystalline ceramic material (Gd,Y)(3)Al2Ga3O12 codoped with Ce and Tb (GYAGG: Ce, Tb) was demonstrated to be a high light yield scintillator. The luminescence kinetics was proven to be formed by the combining of the direct Tb3+-> Ce3+ and inverse Ce3+-> Tb3+ transfer of electronic excitations. This forms a mechanism leading to the increase of the slow component fraction in the scintillation and limits the application of the material, when a fast response is required. However, a high light yield opens an opportunity to utilize the developed material for application in the detectors operating in a current measurement mode and, in long living, as high-flux sources of optical photons under the ionizing radiation of a different type.