Abstract
Ag-doped phosphate glasses are used in radiophotoluminescence (RPL) dosimeters. According to previous papers, Ag0 and Ag2+ emit blue and orange RPL, respectively. However, transfer process of holes to Ag+ from PO43− tetrahedra via heating or time passing is not understood completely. In this study, we aimed to elucidate the cation dependence on the hole-transfer process. To achieve this purpose, we measured variations in electron spin resonance (ESR) and RPL spectra over time in NaPO3 and Ag-doped phosphate glasses with Na (Na/Ag), Na and Al (Na–Al/Ag), Li (Li/Ag), Cs (Cs/Ag), and Rb (Rb/Ag). Based on variations of the ESR signal intensity of holes trapped at PO43− and the RPL intensity, the transfer of holes to Ag+ occurred faster than the recombination of electrons and holes in Na/Ag, Cs/Ag, and Rb/Ag. In Na–Al/Ag, the transfer of holes to Ag+from PO43− and recombination of electrons and holes was completed in nearly the same amount of time. Hole transfer to Ag+occurred faster in the following order: Na/Ag > Cs/Ag > Rb/Ag > Na–Al/Ag > Li/Ag. Electron and hole recombination was completed faster in the following order: Na/Ag > Na–Al/Ag > Li/Ag > Cs/Ag > Rb/Ag. In addition, holes did not transfer back to PO43− from Ag+ during the Ag2+ reduction reaction.
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