Abstract
1 mol% Eu2O3 – 99 mol% CaAl2O4 disc-shaped pellet sample was irradiated with a 5 keV electron beam on one of its surfaces to study the effects of electron bombardment on its structural, vibrational and photo-luminescence properties. X-ray diffraction studies found monoclinic phases of CaAl2O4 (major) and CaAl4O7 (minor) and the Raman spectra showed AlO bond vibrational bands in both the electron-irradiated and virgin (non-irradiated) sample surfaces. Electron irradiated surface has higher concentration of Eu2+ (strong blue light emission at 442 nm) than that of Eu3+ (weak red light emission at 616 nm) as compared to that in the virgin sample. Eu3+ reduce to Eu2+ with electron irradiation and this produces intense blue afterglow with a persistence time of ∼3 s, while the virgin surface exhibits orange-red light emission without afterglow effects.
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