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  • Near-infrared to visible upconversion in Tm3+ and Yb3+ codoped Lu2O3 nanocrystals synthesized by hydrothermal method.

Near-infrared to visible upconversion in Tm3+ and Yb3+ codoped Lu2O3 nanocrystals synthesized by hydrothermal method.

Journal of nanoscience and nanotechnology (2014-04-18)
Li Li, Xingli Zhang, Xiantao Wei, Guangchuan Wang, Changxin Guo
ABSTRACT

Lutetium oxide nanocrystals codoped with Tm3+ and Yb3+ have been successfully synthesized via adjusting the pH values of the precursor solution in a hydrothermal method followed by a subsequent calcination process. The samples were systematically characterized by X-ray diffraction, field-emission scanning microscopy, Fourier transform infrared transmittance spectroscopy, and upconversion luminescent spectra. The experimental results show that the pH values of the precursor solution have great effects on the structural, morphological, and upconversion luminescent properties of Lu2O3:2%Yb3+, 0.2%Tm3+ nanocrystals. The as-formed lutetium oxide precursors could transform to cubic Lu2O3 with the same morphology and a slight shrinkage in size after a calcination process. The upconversion emission intensity of Lu2O3:2%Yb3+, 0.2%Tm3+ nanocrystals obtained from the precursor solution with pH = 9 is the strongest. The enhancement of the upconversion luminescence is suggested to be the consequence of reducing the number of OH- groups and the enlarged nanocrystals size. Strong blue and weak red emissions from the prepared nanocrystals were observed under 980 nm laser excitation, which were attributed to the 1G4 --> 3H6 and 1G4 --> 3F4 transitions of Tm3+ ion, respectively.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Water, ACS reagent
Sigma-Aldrich
Water, suitable for HPLC
Sigma-Aldrich
Water, HPLC Plus
Thulium, foil, not light tested, 25x25mm, thickness 0.025mm, as rolled, 99%
Thulium, foil, 25x25mm, thickness 0.1mm, as rolled, 99%
Thulium, foil, not light tested, 25x25mm, thickness 0.005mm, as rolled, 99%
Thulium, foil, 50x50mm, thickness 0.1mm, as rolled, 99%
Lutetium, powder, 1g, max. particle size 500 micron, 99.9%
Ytterbium, rod, 50mm, diameter 10.0mm, cast, 99%
Ytterbium, lump, 50g, max. size 25mm, 99.9%
Ytterbium, foil, not light tested, 25x25mm, thickness 0.025mm, as rolled, 99%
Thulium, foil, not light tested, 50x50mm, thickness 0.025mm, as rolled, 99%
Thulium, foil, 25x25mm, thickness 0.15mm, as rolled, 99%
Thulium, foil, 50x50mm, thickness 0.15mm, as rolled, 99%
Thulium, foil, not light tested, 25x25mm, thickness 0.002mm, as rolled, 99%
Thulium, foil, not light tested, 12.5x12.5mm, thickness 0.002mm, as rolled, 99%
Thulium, foil, not light tested, 12.5x12.5mm, thickness 0.005mm, as rolled, 99%
Sigma-Aldrich
Distilled water, suitable for HPLC
Supelco
Water, for TOC analysis
Sigma-Aldrich
Water, BioPerformance Certified
Supelco
Water, ACS reagent, for ultratrace analysis
Ytterbium, rod, 50mm, diameter 2.0mm, cast, 99%
Ytterbium, rod, 100mm, diameter 6.35mm, cast, 99%
Ytterbium, foil, not light tested, 25x25mm, thickness 0.005mm, as rolled, 99%
Ytterbium, rod, 50mm, diameter 6.35mm, cast, 99%
Ytterbium, lump, 25g, max. size 25mm, 99.9%
Ytterbium, foil, not light tested, 50x50mm, thickness 0.025mm, as rolled, 99%
Supelco
Water, suitable for ion chromatography
Sigma-Aldrich
E-Toxate Water, endotoxin, free
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Water, sterile-filtered, BioReagent, suitable for cell culture