Hole transfer in Ag-doped phosphate glasses having different cations elucidated by measuring variation of electron spin resonance spectra and photoluminescence spectra over time

Hiroki Kawamoto, Hironori Tanaka, Masanori Koshimizu, Yutaka Fujimoto, Keisuke Asai

Research output: Contribution to journalArticlepeer-review

Abstract

Ag-doped phosphate glasses are used in radiophotoluminescence (RPL) dosimeters. According to previous papers, Ag0 and Ag2+ emit blue and orange RPL, respectively. However, transfer process of holes to Ag+ from PO43− tetrahedra via heating or time passing is not understood completely. In this study, we aimed to elucidate the cation dependence on the hole-transfer process. To achieve this purpose, we measured variations in electron spin resonance (ESR) and RPL spectra over time in NaPO3 and Ag-doped phosphate glasses with Na (Na/Ag), Na and Al (Na–Al/Ag), Li (Li/Ag), Cs (Cs/Ag), and Rb (Rb/Ag). Based on variations of the ESR signal intensity of holes trapped at PO43− and the RPL intensity, the transfer of holes to Ag+ occurred faster than the recombination of electrons and holes in Na/Ag, Cs/Ag, and Rb/Ag. In Na–Al/Ag, the transfer of holes to Ag+from PO43− and recombination of electrons and holes was completed in nearly the same amount of time. Hole transfer to Ag+occurred faster in the following order: Na/Ag > Cs/Ag > Rb/Ag > Na–Al/Ag > Li/Ag. Electron and hole recombination was completed faster in the following order: Na/Ag > Na–Al/Ag > Li/Ag > Cs/Ag > Rb/Ag. In addition, holes did not transfer back to PO43− from Ag+ during the Ag2+ reduction reaction.

Original languageEnglish
Pages (from-to)137-142
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume479
DOIs
Publication statusPublished - 2020 Sep 15

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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