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Rare Earth Distribution in NaRF4: Effect on Up-Conversion Intensity

Published online by Cambridge University Press:  14 November 2013

H.F. Brito ,
J. Hölsä ,
T. Laamanen ,
T. Laihinen ,
M. Lastusaari ,
L.C.V. Rodrigues ,
L. Pihlgren  and
T. Soukka
H.F. Brito
Affiliation:
Universidade de São Paulo, Instituto de Química, São Paulo-SP, Brazil
J. Hölsä
Affiliation:
Universidade de São Paulo, Instituto de Química, São Paulo-SP, Brazil University of Turku, Department of Chemistry, FI-20014 Turku, Finland Turku University Centre for Materials and Surfaces (MatSurf), Turku, Finland
T. Laamanen
Affiliation:
University of Turku, Department of Chemistry, FI-20014 Turku, Finland Turku University Centre for Materials and Surfaces (MatSurf), Turku, Finland
T. Laihinen
Affiliation:
University of Turku, Department of Chemistry, FI-20014 Turku, Finland
M. Lastusaari*
Affiliation:
University of Turku, Department of Chemistry, FI-20014 Turku, Finland Turku University Centre for Materials and Surfaces (MatSurf), Turku, Finland
L.C.V. Rodrigues
Affiliation:
Universidade de São Paulo, Instituto de Química, São Paulo-SP, Brazil University of Turku, Department of Chemistry, FI-20014 Turku, Finland
L. Pihlgren
Affiliation:
University of Turku, Department of Chemistry, FI-20014 Turku, Finland Graduate School of Materials Research (GSMR), Turku, Finland
T. Soukka
Affiliation:
University of Turku, Department of Biochemistry, FI-20014 Turku, Finland
*
* Corresponding author, e-mail: miklas@utu.fi
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Abstract

The NaYF4:Yb3+,Tb3+ (x Yb: 0.20, x Tb: 0.04) materials were prepared by the co-precipitation method. The as-prepared material was washed with and without water and thereafter annealed at 500 °C. This resulted in materials with moderate (with water) and very high (without water) up-conversion luminescence intensity. The structural details causing the differences in luminescence intensity were investigated at room temperature with X-ray powder diffraction and Rietveld analyses. All materials crystallized in the hexagonal form (P63/m, No. 176, Z: 1.5) with a composition very close to stoichimetric. The local structural details revealed microstrains in the rare earth sublattice that were relaxed for the material with very high up-conversion luminescence intensity thus decreasing energy losses and enhancing up-conversion.

Keywords

X-ray powder diffractionup-conversionytterbiumterbiumNaYF4

Information

Type
Technical Articles
Information
Powder Diffraction , Volume 28 , Supplement S2 , September 2013 , pp. S41 - S50
Copyright
Copyright © International Centre for Diffraction Data 2013 

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