| Autor: |
Umar Zafari, Musashi Sagayama, Mekhrdod Subhoni, Alok M. Srivastava, William W. Beers, William E. Cohen, Chong-Geng Ma, Michal Piasecki, Mikhail G. Brik, Tomoyuki Yamamoto |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Optical Materials: X, Vol 16, Iss , Pp 100197- (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2590-1478 |
| DOI: |
10.1016/j.omx.2022.100197 |
| Popis: |
Influence of co-dopings of divalent ions such as Mg2+, Zn2+, Cd2+ and Sr2+ ions in Mn4+-doped CaAl12O19 red phosphor on its photoluminescence characteristics has been investigated. Samples of Mn4+-doped CaAl12O19 and co-doped with Mg2+, Zn2+, Cd2+ and Sr2+ ions were synthesized by a solid-state reaction method. Significant enhancement of photoluminescence intensity was observed, when Mg2+ and Zn2+ were co-doped in Mn4+-doped CaAl12O19, while only slight enhancement was seen with Cd2+ and Sr2+ co-dopings. To investigate these differences in photoluminescence enhancement, change in local environment of Mn4+ ions due to co-dopings of divalent ions was examined by electron spin resonance (ESR) measurements and first principles calculations within a density functional theory. From these experimental and theoretical analysis, it has been confirmed that the local environment of Mn4+ changes significantly with Mg2+ and Zn2+ co-dopings, while Cd2+ and Sr2+ alter minimally the local environment of Mn4+ due to different substitution site. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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