Spectral Characteristics of Photoluminescence Synthesized in the Field of Radiation YAGG Phosphors with Different Al/Ga Ratio

Abstract

In the study the results of luminescence spectra investigating and excitation of ceramics luminescence with different Al/Ga ratios, synthesized by irradiating a mixture of initial materials with different prehistories were presented. Mixtures of oxides powders with stoichiometric composition corresponding to Y₃Al_xGa_5-xO₁₂: Ce, where x ranged from 0 to 5, were prepared for synthesis. All initial materials had a purity of no less than ana- lytical grade. The synthesis was carried out under the influence of an electron beam with an energy of 1.4 MeV and a power density of 20 kW/cm². The yield of the synthesis reaction, the ratio of the sample mass to the mixture, was 90‒95 %. Research has shown that decreasing the Al/Ga ratio results in a shift of the lu- minescence band towards the short-wavelength region of the spectrum. Additionally, the excitation spectrum changes. As the Al/Ga ratio decreases, the excitation band shifts towards the long-wavelength region around 350 nm. The characteristics of luminescence are influenced by the prehistory of the initial materials.