In this work, we present the results of the structure and luminescence properties of YAG:Ce (Y₃Al₅O₁₂ doped with Ce³⁺ ions) ceramic samples. Their synthesis was carried out by sintering samples from the initial oxide powders under the powerful action of a high-energy electron beam with an energy of 1.4 MeV and a power density of 22–25 kW/cm². The measured diffraction patterns of the synthesized ceramics are in good agreement with the standard for YAG. Luminescence characteristics at stationary/time-resolved regimes were studied. It is shown that under the influence of a high-power electron beam on a mixture of powders, it is possible to synthesize YAG:Ce luminescent ceramics with characteristics close to the well-known YAG:Ce phosphor ceramics obtained by traditional methods of solid-state synthesis. Thus, it has been demonstrated that the technology of radiation synthesis of luminescent ceramics is very promising.

Radiation synthesis differs from known methods in its high rate of energy input. Radiation energy is instantly introduced into the entire volume of the charge, which is 6 to 12 mm thick, depending on the electron energy. The introduced energy is used to create electronic excitations, the relaxation of which results in the formation of a new material, IAG: Ceramics made from Y₂O₃ and Al₂O₃ powders with a Ce₂O₃ activator. The overall ceramic formation process is independent of electron energy in the range of 1.4–2.5 MeV. The efficiency of radiation synthesis of IAG: Ceramics depends on the power density of the electron flux incident on the surface of the treated charge and the duration of radiation treatment. There is a clearly defined threshold for the power density of the electron flux above which synthesis occurs: that is, the density of the generated electronic excitations and radiolysis products upon decay must exceed the threshold values. The morphology of the synthesized ceramic is determined by the irradiation time. When the irradiation time of the feedstock is less than 1 s, the outer surface has time to solidify, resulting in a ceramic with large pores. When the irradiation time of the feedstock exceeds 5 s, the porosity of the resulting ceramic is much lower.