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- W2059598364 abstract "Abstract Lanthanum oxyfluoride (LaOF) nanocrystalline powders doped with Eu 3+ , Tb 3+ and co-doped with both rare-earth elements were prepared by combustion synthesis. Surface morphology and structure of the powders were investigated by scanning electronic microscopy and X-ray powder diffraction. Luminescence experiments were performed with ultraviolet light ( λ = 254 nm and 355 nm). On the basis of the analysis of the luminescence spectra, these powders display the characteristic 4f–4f emissions of Tb 3+ and Eu 3+ ions with the most intense emission lines being 5 D 4 → 7 F 5 (541 nm) from Tb 3+ and 5 D 0 → 7 F 2 (612 nm) from Eu 3+ . It was observed an enhancement of the red emission at 612 nm from Eu 3+ ions in co-doped samples. From the analysis of Tb 3+ emission decay curves it is deduced that Tb 3+ transfers energy to Eu 3+ . The energy transfer mechanism was found to be of a resonant type via a dipole–dipole mechanism. The energy transfer efficiency and the critical transfer distance were estimated by the luminescence dynamics analysis." @default.
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- W2059598364 date "2015-01-01" @default.
- W2059598364 modified "2023-10-03" @default.
- W2059598364 title "Investigation of Eu3+ luminescence enhancement in LaOF powders codoped with Tb3+ and prepared by combustion synthesis" @default.
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- W2059598364 doi "https://doi.org/10.1016/j.jallcom.2014.08.140" @default.
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