Rare Earth Distribution in NaRF4: Effect on Up-Conversion Intensity
: 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
: 2013
: Powder Diffraction
: POWDER DIFFRACTION
: POWDER DIFFR
: 28
: S41
: S50
: 10
: 0885-7156
DOI: https://doi.org/10.1017/S0885715613001164(external)
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.