INFLUENCE OF SURFACE-CHARGE ON THE CATHODOLUMINESCENCE OF CE-YAG

Cathodoluminescence of surface-charged Ce:YAG crystals was carried out . it was found that the familiar YAG defect emission band at 300 nm ha d a stronger dependence on the incident electron beam energy and accum ulated surface charge than the cerium emission band at 550 nm. Lumines cent relaxations, observed upon charging and discharging, appear to be due to charge migrations within the active region of crystal bulk. Th e experimental results are consistent with the association of the defe ct luminescent center with electrons trapped at oxygen vacancies.