Wydział Chemii

Joanna Trojan-Piegza

Eugeniusz Zych

Dariusz Hreniak

Wiesław Stręk

2004

Journal of Alloys and Compounds

380

123-129

10.1016/j.jallcom.2004.03.039

Naukowa

Angielski

Artykuł

Two series of Lu₂O₃:Eu nanocrystalline phosphors were prepared using either combustion procedure with urea fuel or the Pechini procedure. The dopant concentration varied in both series from 0.2 to 13% with respect to Lu. Despite full crystallization and very similar microstructure of materials of both series, we found profound variations in their spectroscopic properties. The combustion-made phosphors were much less efficient emitters and their emission was strongly concentration-quenched above 3% of the dopant content. For the Pechini-derived materials, the concentration quenching was not observed below 10% of the dopant content and even for the dopant concentrations equal to 10 and 13% the quenching was insignificant. In EPR spectra for Gd³⁺-doped materials, a significant broadening of lines was found for the combustion-made powders. All these observations imply a strong agglomeration of the dopant ions in the specimens made by applying urea fuel in the combustion process. A semi-two-phase composition was suggested in the combustion-prepared powders. In the Pechini-derived nanocrystalline powders, the dopant ions are uniformly, statistically distributed in the host lattice.

Nanocrystalline phosphors, Eu3+ luminescence, Concentration quenching, Activator distribution

https://doi.org/10.1016/j.jallcom.2004.03.039

http://www.elsevier.com