Up-conversion luminescence of the NaRF4-NaR'F4 (R: Y, Yb, Er) core-shell nanomaterials.
Up-converting NaRF(4)-NaR'F(4) (R: Y, Yb, Er) nanomaterials with different core-shell combinations were prepared with the co-precipitation method. The X-ray powder diffraction (XPD) measurements revealed the presence of both the cubic and hexagonal NaRF(4) phases. The crystallite sizes calculated with the Scherrer formula were 100 and 150 nm for the cubic and hexagonal phases, respectively. The FT-IR spectra showed water impurities. The up-conversion luminescence and luminescence decays were studied with NIR laser excitation at 970 nm. The up-conversion luminescence spectra showed strong red (640-685 nm) ((4)F(9/2) → (4)I(15/2)) and moderate green (515-560 nm) ((2)H(11/2,) (4)S(3/2) → (4)I(15/2)) Er(3+) luminescence. The strongest up-conversion luminescence and longest red luminescence decay was obtained from the Na(Y,Yb)F(4)-NaErF(4) core-shell combination.
Hyppänen
Iko
I
Department of Chemistry, University of Turku, FI-20014 Turku, Finland.
Hölsä
Jorma
J
Kankare
Jouko
J
Lastusaari
Mika
M
Pihlgren
Laura
L
Soukka
Tero
T
D004871:Erbium / Q000737:chemistry*; D007259:Infrared Rays; D049449:Luminescence; D015394:Molecular Structure; D049329:Nanostructures / Q000737:chemistry*; D014961:X-Ray Diffraction; D015018:Ytterbium / Q000737:chemistry*
D004871:Erbium; D015018:Ytterbium
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19367869
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14719973
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14618592
Ann N Y Acad Sci. 2008;1130:267-71
18596358
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16741910