Radiophotoluminescence properties of Ag2O–Cs2O–BaO–Al2O3–P2O5 glasses

Abstract

In this study, we synthesized Ag2O–Cs2O–BaO–Al2O3–P2O5 glasses with different Ag concentrations (0.1, 0.3, 1.0, and 3.0%) using the melt-quenching method and investigated the optical properties and the spatial resolution as an imaging plate. These glasses showed luminescence at around 340 nm upon 230 nm excitation before X-ray irradiation and luminescence at around 620 nm upon 340 nm excitation after X-ray irradiation. The lifetimes for the 340 and 620 nm emissions were 7.2–32.2 μs and 15.6–19.7 ns, respectively. Based on the emission wavelength and lifetimes, the luminescence at 340 and 620 nm was considered to originate from Ag+ and Ag2+, respectively. In other words, the results suggested that these glasses showed the radio-photoluminescence (RPL) phenomenon. The emission intensity of Ag2+ increased with annealing at 100–200 °C and disappeared by annealing at 600 °C in all the Ag-doped samples. The 3.0% Ag-doped sample indicated the highest emission intensity of Ag2+ and the spatial resolution of 10 LP/mm.