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• W3088596876 endingPage "225" @default.
• W3088596876 startingPage "218" @default.
• W3088596876 abstract "On the base of β-NaYF4 and β-NaLuF4 compounds, optimal synthesis methods were selected to obtain highly crystalline Eu3+-doped compounds in the hexagonal (β) structure. The compounds β-NaY0.95Eu0.05F4 and β-NaLu0.95Eu0.05F4 were synthesized by hydrothermal synthesis. The concentration of Na2EDTA introduced into the reaction system as a modifier affects the shape and size of the product from elongated hexagonal prisms to quartz-like crystals. The thermal behavior of the compounds has been studied; the temperature of the polymorphic transition from hexagonal to cubic structure is 680 °C for β-NaY0.95Eu0.05F4 and 624 °C for β-NaY0.95Eu0.05F4, the melting point of α-NaRE0.95Eu0.05F4 is about 900 °C. Under excitation with UV-light of λ = 393 nm, β-NaY0.95Eu0.05F4 and β-NaLu0.95Eu0.05F4 show the emission lines of direct Eu3+ f-f transitions, with the presence of the emission from higher Eu3+ excited states (up to 5H3) in both samples, which is responsible for the more orange color of emission instead of the usual red for Eu3+. Emission decay times are slightly longer for β-NaY0.95Eu0.05F4 than for β-NaLu0.95Eu0.05F4, which is the result of a bigger unit cell for the former, leading to longer interatomic distances between Eu3+ ions in the lattice. The luminescence mechanisms for the doped lanthanide ions were thoroughly analyzed." @default.
• W3088596876 created "2020-10-01" @default.
• W3088596876 creator A5016166797 @default.
• W3088596876 creator A5068083066 @default.
• W3088596876 creator A5070462815 @default.
• W3088596876 creator A5088130181 @default.
• W3088596876 date "2020-12-01" @default.
• W3088596876 modified "2023-10-01" @default.
• W3088596876 title "Synthesis and luminescence properties of β-NaRE0.95Eu0.05F4 (RE Y, Lu)" @default.
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• W3088596876 doi "https://doi.org/10.1016/j.jiec.2020.09.008" @default.
• W3088596876 hasPublicationYear "2020" @default.
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