Radiophotoluminescence behavior in Ag-doped phosphate glasses
Hiroki Kawamoto, Masanori Koshimizu, Yutaka Fujimoto, Keisuke Asai
Abstract
Abstract Radiophotoluminescence (RPL) is an emission phenomenon induced by the photoexcitation of luminescent centers (RPL centers) formed by ionizing radiation. Ag-doped phosphate glasses exhibiting RPL are applied in glass badge dosimeters used for personal monitoring. In this paper, we discuss the RPL behavior of Ag-doped phosphate glasses and their properties along with RPL center formation and disappearance mechanisms. When Ag-doped phosphate glasses are exposed to ionizing radiation, Ag 0 , Ag 2+ , and Ag m n+ , such as Ag 2 + , clusters are formed because Ag + acts as an electron and hole trap. Ag 2+ is formed by the transfer of holes from PO 4 3− tetrahedra. On the other hand, electrons are trapped by Ag + to form Ag 0 . Subsequently, Ag 2 + is formed by the association between Ag 0 and Ag + owing to the diffusion of Ag + . Ag 0 is attributed to blue RPL center, while Ag 2+ and Ag 2 + are attributed to orange RPL centers. Moreover, Ag 2 + and Ag 2+ disappear upon heating at 500 and 673 K, respectively.