Investigation of Luminescence Processes in YAG Single Crystals Irradiated by 50 MEV Electron Beam
Absorption, emission and excitation spectra of 50 MeV electron beam irradiated and asgrown YAG single crystals were studied and compared in the 10-300 K temperature range using timeresolved luminescence spectroscopy under UV/VUV/XUV excitation by synchrotron radiation and cathodoluminescence. The emission spectra consist of intrinsic (excitonic) and defect related nonelementary 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.