Abstract
Ag-doped phosphate glasses containing Na and Al cations have been used in radiophotoluminescence (RPL) dosimeters. The formation mechanism of RPL center (Ag2+ and ) in Ag-doped phosphate glasses, containing various cations, has unresolved issues. Herein, we investigated the mechanism of the RPL center formation in Ag-doped phosphate glasses from the viewpoints of temperature dependence and activation energy of RPL center formation. We estimated the activation energies of RPL center formation in Ag-doped phosphate glasses containing Na and Al (Na-Al/Ag), Na and K (Na-K/Ag), and Al and K (Al-K/Ag) cations. The activation energy of formation did not increase with the first ionization energy of the cations contained in the glasses. This result suggests that electrons are trapped not at cations but at negative ion vacancies before forming Furthermore, the activation energy of formation increased with increasing mean molecular volume as the distance between the electron trapping site and increases. On the other hand, the activation energy of formation decreased with increasing mean molecular volume which is the opposite of the result of Consideration of temperature dependence of RPL intensity, the intensity of the RPL corresponding to in Al-K/Ag increased slightly at 300 K from that at 25 K. In addition, the concentration at 25 K in Al-K/Ag was approximately half of that at 300 K. These results indicate that only holes trapped at shallow trap sites transfer to in Al-K/Ag.
| Original language | English |
|---|---|
| Article number | 062003 |
| Journal | Japanese journal of applied physics |
| Volume | 58 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2019 |
ASJC Scopus subject areas
- Engineering(all)
- Physics and Astronomy(all)
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Temperature dependence of radiophotoluminescence in Ag-doped phosphate glasses containing different alkali metals. / Kawamoto, Hiroki; Fujimoto, Yutaka; Koshimizu, Masanori; Okada, Go; Yanagida, Takayuki; Asai, Keisuke.
In: Japanese journal of applied physics, Vol. 58, No. 6, 062003, 2019.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Temperature dependence of radiophotoluminescence in Ag-doped phosphate glasses containing different alkali metals
AU - Kawamoto, Hiroki
AU - Fujimoto, Yutaka
AU - Koshimizu, Masanori
AU - Okada, Go
AU - Yanagida, Takayuki
AU - Asai, Keisuke
N1 - Funding Information: Hiroki Kawamoto Yutaka Fujimoto Masanori Koshimizu Go Okada Takayuki Yanagida Keisuke Asai Hiroki Kawamoto Yutaka Fujimoto Masanori Koshimizu Go Okada Takayuki Yanagida Keisuke Asai Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan Kanazawa Institute of Technology, Ohgigaoka, Nonoichi, Ishikawa 921-8501, Japan Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan Hiroki Kawamoto, Yutaka Fujimoto, Masanori Koshimizu, Go Okada, Takayuki Yanagida and Keisuke Asai 2019-06-01 2019-05-03 10:30:49 cgi/release: Article released bin/incoming: New from .zip The Ministry of Education, Culture, Sports, Science and Technology Grant-in Aid for Scientific Research (A) No. 18H03890 yes Ag-doped phosphate glasses containing Na and Al cations have been used in radiophotoluminescence (RPL) dosimeters. The formation mechanism of RPL center (Ag 2+ and ) in Ag-doped phosphate glasses, containing various cations, has unresolved issues. Herein, we investigated the mechanism of the RPL center formation in Ag-doped phosphate glasses from the viewpoints of temperature dependence and activation energy of RPL center formation. We estimated the activation energies of RPL center formation in Ag-doped phosphate glasses containing Na and Al (Na–Al/Ag), Na and K (Na–K/Ag), and Al and K (Al–K/Ag) cations. The activation energy of formation did not increase with the first ionization energy of the cations contained in the glasses. This result suggests that electrons are trapped not at cations but at negative ion vacancies before forming Furthermore, the activation energy of formation increased with increasing mean molecular volume as the distance between the electron trapping site and increases. On the other hand, the activation energy of formation decreased with increasing mean molecular volume which is the opposite of the result of Consideration of temperature dependence of RPL intensity, the intensity of the RPL corresponding to in Al–K/Ag increased slightly at 300�K from that at 25�K. In addition, the concentration at 25�K in Al–K/Ag was approximately half of that at 300�K. These results indicate that only holes trapped at shallow trap sites transfer to in Al–K/Ag. � 2019 The Japan Society of Applied Physics [1] Perry J. A. and Dosimetry R. P. L. 1987 Radiophotoluminescence in Health Physics (Bristol: Adam Hilger) p. 3 Perry J. A. and Dosimetry R. P. L. Radiophotoluminescence in Health Physics 1987 3 [2] Huang D. Y. C. and Hsu S. M. 2011 Advances in Center Therapy ed H. G. Muhtasib (Rijeka: InTech) p. 553 Huang D. Y. C. and Hsu S. M. ed Muhtasib H. G. Advances in Center Therapy 2011 553 [3] Martini M. and Meinardi F. 1997 Rivi. 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PY - 2019
Y1 - 2019
N2 - Ag-doped phosphate glasses containing Na and Al cations have been used in radiophotoluminescence (RPL) dosimeters. The formation mechanism of RPL center (Ag2+ and ) in Ag-doped phosphate glasses, containing various cations, has unresolved issues. Herein, we investigated the mechanism of the RPL center formation in Ag-doped phosphate glasses from the viewpoints of temperature dependence and activation energy of RPL center formation. We estimated the activation energies of RPL center formation in Ag-doped phosphate glasses containing Na and Al (Na-Al/Ag), Na and K (Na-K/Ag), and Al and K (Al-K/Ag) cations. The activation energy of formation did not increase with the first ionization energy of the cations contained in the glasses. This result suggests that electrons are trapped not at cations but at negative ion vacancies before forming Furthermore, the activation energy of formation increased with increasing mean molecular volume as the distance between the electron trapping site and increases. On the other hand, the activation energy of formation decreased with increasing mean molecular volume which is the opposite of the result of Consideration of temperature dependence of RPL intensity, the intensity of the RPL corresponding to in Al-K/Ag increased slightly at 300 K from that at 25 K. In addition, the concentration at 25 K in Al-K/Ag was approximately half of that at 300 K. These results indicate that only holes trapped at shallow trap sites transfer to in Al-K/Ag.
AB - Ag-doped phosphate glasses containing Na and Al cations have been used in radiophotoluminescence (RPL) dosimeters. The formation mechanism of RPL center (Ag2+ and ) in Ag-doped phosphate glasses, containing various cations, has unresolved issues. Herein, we investigated the mechanism of the RPL center formation in Ag-doped phosphate glasses from the viewpoints of temperature dependence and activation energy of RPL center formation. We estimated the activation energies of RPL center formation in Ag-doped phosphate glasses containing Na and Al (Na-Al/Ag), Na and K (Na-K/Ag), and Al and K (Al-K/Ag) cations. The activation energy of formation did not increase with the first ionization energy of the cations contained in the glasses. This result suggests that electrons are trapped not at cations but at negative ion vacancies before forming Furthermore, the activation energy of formation increased with increasing mean molecular volume as the distance between the electron trapping site and increases. On the other hand, the activation energy of formation decreased with increasing mean molecular volume which is the opposite of the result of Consideration of temperature dependence of RPL intensity, the intensity of the RPL corresponding to in Al-K/Ag increased slightly at 300 K from that at 25 K. In addition, the concentration at 25 K in Al-K/Ag was approximately half of that at 300 K. These results indicate that only holes trapped at shallow trap sites transfer to in Al-K/Ag.
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UR - http://www.scopus.com/inward/citedby.url?scp=85070752493&partnerID=8YFLogxK
U2 - 10.7567/1347-4065/ab0c84
DO - 10.7567/1347-4065/ab0c84
M3 - Article
AN - SCOPUS:85070752493
VL - 58
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 6
M1 - 062003
ER -