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• W4386565967 endingPage "e20006" @default.
• W4386565967 startingPage "e20006" @default.
• W4386565967 abstract "We investigated the changes in the structural and luminescent properties of Eu-ion-doped A2SiO4 (A2SiO4:Eu, A = Ba, Sr, and Ca) by annealing in oxidizing and reducing atmospheres. The initially synthesized samples displayed distinct, intense red emissions at approximately 600 and 700 nm, which can be attributed to the presence of Eu3+ ions. The emission intensity of Eu3+ was the strongest in Ca2SiO4:Eu, which exhibited the lowest lattice symmetry among the three samples. Remarkably, following annealing in a reducing atmosphere (H2), the previously observed red emission vanished, and instead, a strong green emission at around 500 nm, which is characteristic of Eu2+ ions. Because of the two occupation sites of the Eu ions in A2SiO4, the emission of Eu2+ strongly depends on the excitation wavelength, which is the most evident in Ca2SiO4:Eu. Conversely, after annealing in an oxidizing atmosphere (O2), the emission in the green region was suppressed and the emission in the red region returned. The reversible transition between two oxidation states occurred repeatedly by alternating H2 and O2 annealing, resulting in good color tunability in wide visible region with a simple ambient annealing process in a single compound." @default.
• W4386565967 created "2023-09-10" @default.
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• W4386565967 date "2023-09-01" @default.
• W4386565967 modified "2023-10-11" @default.
• W4386565967 title "Valence state switching and reversible emission tunability of A2SiO4 (A = Ba, Sr, and Ca) with two-site substitution of Eu ions through simple thermal treatment" @default.
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• W4386565967 doi "https://doi.org/10.1016/j.heliyon.2023.e20006" @default.
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