| Paper Abstract and Keywords |
| Presentation |
2026-01-30 10:10
[Poster Presentation]
Evaluation of energy level and luminescence properties of Sr2MgSi2O7:Eu2+,Dy3+ phosphor by Ca substitution
Jumpei Kamikawa, Nie Koki, Tomohiro Kawashima, Hiroko Kominami, Nobuhisa Fujima, Kazuhiko Hara (Shizuoka Univ.) |
| Abstract |
(in Japanese) |
(See Japanese page) |
| (in English) |
This study explores the simultaneous control of emission color and persistent luminescence in Sr2MgSi2O7:Eu2+,Dy3+ (SMS) by substituting Ca for Sr. Samples with compositions Sr(1.98-x)CaxSi2O7:Eu,Dy (x = 0–1.98) were synthesized via solid-state reaction and characterized using XRD, PL, PLE, TL, and fluorescence lifetime measurements. Additionally, first-principles calculations based on density functional theory (DFT) were performed to analyze changes in bandgap, defect levels, and Eu/Dy energy states. Experimental results revealed that Ca substitution caused a redshift of the emission peak, reduced afterglow intensity, and shifted TL peaks toward lower temperatures. The absorption edge also moved slightly to lower energy, suggesting a minor bandgap reduction. Computational analysis confirmed that the bandgap narrowing was small (~0.2 eV) and no significant changes in oxygen defect levels or rare-earth f-state positions were observed. These findings indicate that Ca substitution primarily modifies the local crystal field, influencing Eu²⁺ 4f–5d transition energy and trap level distribution, thereby accelerating afterglow decay and inducing a color shift. |
| Keyword |
(in Japanese) |
(See Japanese page) |
| (in English) |
long-afterglow / Sr2MgSi2O7 / phosphor / Ca substitution / first-principles calculations / / / |
| Reference Info. |
ITE Tech. Rep., vol. 50, no. 2, IDY2026-17, pp. 65-68, Jan. 2026. |
| Paper # |
IDY2026-17 |
| Date of Issue |
2026-01-22 (IDY) |
| ISSN |
Online edition: ISSN 2424-1970 |
| Download PDF |
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| Conference Information |
| Committee |
IEICE-EID IDY IEE-EDD SID-JC IEIJ-SSL |
| Conference Date |
2026-01-29 - 2026-01-30 |
| Place (in Japanese) |
(See Japanese page) |
| Place (in English) |
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| Topics (in Japanese) |
(See Japanese page) |
| Topics (in English) |
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| Paper Information |
| Registration To |
IDY |
| Conference Code |
2026-01-EID-IDY-EDD-JC-SSL |
| Language |
Japanese |
| Title (in Japanese) |
(See Japanese page) |
| Sub Title (in Japanese) |
(See Japanese page) |
| Title (in English) |
Evaluation of energy level and luminescence properties of Sr2MgSi2O7:Eu2+,Dy3+ phosphor by Ca substitution |
| Sub Title (in English) |
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| Keyword(1) |
long-afterglow |
| Keyword(2) |
Sr2MgSi2O7 |
| Keyword(3) |
phosphor |
| Keyword(4) |
Ca substitution |
| Keyword(5) |
first-principles calculations |
| Keyword(6) |
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| Keyword(7) |
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| Keyword(8) |
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| 1st Author's Name |
Jumpei Kamikawa |
| 1st Author's Affiliation |
Shizuoka University (Shizuoka Univ.) |
| 2nd Author's Name |
Nie Koki |
| 2nd Author's Affiliation |
Shizuoka University (Shizuoka Univ.) |
| 3rd Author's Name |
Tomohiro Kawashima |
| 3rd Author's Affiliation |
Shizuoka University (Shizuoka Univ.) |
| 4th Author's Name |
Hiroko Kominami |
| 4th Author's Affiliation |
Shizuoka University (Shizuoka Univ.) |
| 5th Author's Name |
Nobuhisa Fujima |
| 5th Author's Affiliation |
Shizuoka University (Shizuoka Univ.) |
| 6th Author's Name |
Kazuhiko Hara |
| 6th Author's Affiliation |
Shizuoka University (Shizuoka Univ.) |
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| Speaker |
Author-1 |
| Date Time |
2026-01-30 10:10:00 |
| Presentation Time |
5 minutes |
| Registration for |
IDY |
| Paper # |
IDY2026-17 |
| Volume (vol) |
vol.50 |
| Number (no) |
no.2 |
| Page |
pp.65-68 |
| #Pages |
4 |
| Date of Issue |
2026-01-22 (IDY) |