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Sensors and Materials, Volume 36, Number 2(2) (2024)
Copyright(C) MYU K.K.
pp. 607-621
S&M3550 Research Paper of Special Issue
Published: February 20, 2024

Radio-photoluminescence in Ag-doped Na–Al Borate Glass [PDF]

Hiroki Kawamoto, Yutaka Fujimoto, and Keisuke Asai

(Received October 30, 2023; Accepted January 22, 2024)

Keywords: radio-photoluminescence, dosimeter, valence change of Ag, clustering of Ag, borate glass

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 boron-oxygen network to form a boron oxygen hole center (BOHC). Subsequently, the trapped holes transfer to Ag+ from BOHC and form Ag2+.

Corresponding author: Hiroki Kawamoto

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Cite this article
Hiroki Kawamoto, Yutaka Fujimoto, and Keisuke Asai, Radio-photoluminescence in Ag-doped Na–Al Borate Glass, Sens. Mater., Vol. 36, No. 2, 2024, p. 607-621.

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