Abstract
Results are presented from measurements of radiophotoluminescence (RPL), optical absorption (OA) and electron paramagnetic resonance (EPR) on Ag-doped alkali-phosphate glass. The build-up phenomenon for RPL is followed during and after irradiation. Reversal of this build-up is induced via exposure to ultra-violet light (UV) at a wavelength of 254 nm and changes to the RPL emitting centers and the EPR spectra are followed during and after UV exposure. The experimental results indicate that Ag2+ centers may be the main centers responsible for RPL emission in the orange region of the spectrum, peaking around 630 nm. Computer simulations of the rate equations describing the suggested charge transfer processes occurring during irradiation, build-up and UV exposure qualitatively support these conclusions.
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