| Abstrakt: |
In this paper, we report on the radio-photoluminescence (RPL) properties and RPL center formation mechanism in Ag-doped Na-Al borate glass (BG:Ag). In BG:Ag, broad emission bands at 550-800 and 450-800 nm with excitation wavelengths at 320 and 360 nm appeared after X-ray irradiation, respectively. The electron spin resonance (ESR) signal intensity of Ag2+ and Ag2+ increased with absorption dose. These results suggest that BG:Ag exhibits RPL from Ag2+ and Ag2+. Furthermore, RPL emission bands and the ESR signals of Ag2+ and Ag2+ disappeared after heating at 773 K for 1 h. These results indicate that RPL centers can be eliminated by heating and that BG:Ag is a candidate reusable RPL material. On the basis of the variation of the ESR spectra with time from immediately after irradiation, we assumed the following RPL center formation mechanism. First, electron-hole pairs are generated by ionizing radiation. Some of the electrons are trapped at Ag+ and form Ag0. Subsequently, Ag2 + ions are formed by the association of Ag+ and Ag0. On the other hand, holes are trapped at the boronoxygen network to form a boron oxygen hole center (BOHC). Subsequently, the trapped holes transfer to Ag+ from BOHC and form Ag2+. [ABSTRACT FROM AUTHOR] |
