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Inne
Structural and luminescent properties of nano-sized NaGdF4: Eu3+ synthesised by wet-chemistry route.
Autorzy
Rok wydania
2004
Czasopismo
Journal of Alloys and Compounds
Numer woluminu
380
Strony
315-320
DOI
10.1016/j.jallcom.2004.03.005
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Hexagonal Eu3+:NaGdF4 fluoride with average grains size of 20 nm was obtained from solution by a co-precipitation method. Morphology of the obtained powder was examined by XRD and TEM methods. Absence of the Eu3+-O2− charge-transfer band, expected in excitation spectrum at ∼260 nm indicates, that oxygen ions are not incorporated into a fluoride lattice. As-received fluoride contains considerable amounts of the water molecules, adsorbed at the surface of the material, which may be relatively easily removed by heating the powder at 300 °C. Thermal treatment at 650 °C is sufficient for removing of the OH− groups built into fluoride lattice. Influence of method of synthesis as well as oxygen, water molecules and OH− groups content on optical properties of the obtained phosphors is investigated and discussed by comparison with optical properties of the Eu3+:NaGdF4 fluoride synthesised by a solid-state reaction.
Słowa kluczowe
Phosphors, Nanostructures, Morphology, Precipitation, Luminescence, NaGdF4
Adres publiczny
https://doi.org/10.1016/j.jallcom.2004.03.005
Strona internetowa wydawcy
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