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A. Alikhanyan National Science Laboratory (YerPhI), Yerevan, Armenia ; National Research University “High School of Economics”, (NRU HSE), Moscow, Russia ; Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia
Absorption, emission and excitation spectra of 50 MeV electron beam irradiated and as-grown YAG single crystals were studied and compared in the 10-300 K temperature range using time-resolved luminescence spectroscopy under UV/VUV/XUV excitation by synchrotron radiation and cathodoluminescence. The emission spectra consist of intrinsic (excitonic) and defect related non-elementary bands in the VIS/UV range. It is shown that fast electrons create stable F and F+ color centers with characteristic emission and absorption bands in the visible/UV range. Induced absorption caused from these defects starts at 4.2 eV. Energy transfer from host to color centers is not efficient process.