Electron and hole capture processes in Cu-doped glass exhibiting radiophotoluminescence

Author:

Hashikawa Ryo,Takada Yuya,Nishi Yusaku,Kinomura Atsushi,Saito Takeshi,Okada Arifumi,Wakasugi Takashi,Kadono KoheiORCID

Abstract

Abstract Radiophotoluminescence (RPL) is a radiation effect, and materials exhibiting RPL can be used in dosimeters. In this study, we observed remarkable RPL in Cu-doped aluminoborosilicate and silica glasses upon their exposure to 60Co γ-rays. The RPL intensity increased proportionally with the irradiation dose up to several hundreds of grays and then saturated beyond a certain dose level. An equation was derived theoretically to express the relationship between the RPL intensity and irradiation dose based on the RPL mechanism, in which copper ions, Cu2+ and Cu+, capture electrons and holes, generated by the irradiation, respectively, resulting in a change in the valence. The equation fitted well with the experimental results, providing two parameters for the equation. These parameters are associated with the saturation dose level and sensitivity, which are important for the application of materials to dosimeters. These parameters were discussed based on electron and hole capture processes in the RPL mechanism.

Funder

Visiting Researcher’s Program of the Institute for Integrated Radiation and Nuclear Science, Kyoto University

Publisher

IOP Publishing

Subject

Condensed Matter Physics,General Materials Science

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