Radio-photoluminescence phenomenon in Ag-doped Cs₂O–CaO–Al₂O₃–P₂O₅ glasses

Abstract

In this study, Ag2O–Cs2O–CaO–Al2O3–P2O5 glasses with different Ag concentrations (0, 0.1, 0.3, 1.0, and 3.0 mol.%) were made by the melt-quenching method. The photoluminescence (PL) properties, the radio-photoluminescence (RPL) phenomenon, and the spatial resolution of X-ray imaging based on RPL were studied to aim for the X-ray imaging application. The RPL phenomenon was observed as an appearance of a new PL emission at around 620 nm after X-ray irradiation. According to the shape of the PL spectrum and lifetime (13.1–16.7 ns), the luminescence was confirmed to be due to Ag2+. In addition, the 3.0% Ag-doped sample had the highest emission intensity of Ag2+. From the X-ray imaging resolution test, the 3.0% Ag-doped sample showed a spatial resolution of at least 10.0 LP/mm.