Abstract
The mechanism of Photo-stimulated Luminescence (PSL) is investigated in copper and europium doped KCl. Electron Paramagnetic Resonance, Photoluminescence, and X-ray Photoelectron Spectroscopy measurements were performed on powdered samples of KCl: Cu+ and KCl: Eu2+, γ-irradiated at room temperature. Our results show that the charge state conversion of Cu+ to Cu2+ does not take place after γ-irradiation in KCl: Eu2+, even though a significant reduction in Eu2+ concentration is detected after γ-irradiation, the PSL is not due to Eu3+-F recombination. The energy transfer from recombination process involving F centers to the activator ions Cu+ and Eu2+ in KCl seems to cause the PSL in these materials.
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