A1 Refereed original research article in a scientific journal
Rare Earth Distribution in NaRF4: Effect on Up-Conversion Intensity
Authors: Brito H F, Hölsä J, Laamanen T, Laihinen T, Lastusaari M, Pihlgren L, Rodrigues L C V, Soukka T
Publisher: J C P D S-INT CENTRE DIFFRACTION DATA
Publication year: 2013
Journal: Powder Diffraction
Journal name in source: POWDER DIFFRACTION
Journal acronym: POWDER DIFFR
Volume: 28
First page : S41
Last page: S50
Number of pages: 10
ISSN: 0885-7156
DOI: https://doi.org/10.1017/S0885715613001164
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 degrees 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 (P6(3)/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.
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 degrees 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 (P6(3)/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.
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