Wydział Chemii

Eugeniusz Zych

Joanna Trojan-Piegza

P. Dorenbos

2004

Radiation Measurements

38

471-474

10.1016/j.radmeas.2004.03.027

Naukowa

Angielski

Artykuł

Nanocrystalline powders of Lu ₂ O ₃ :Eu with the activator content varying in the range of 0.2–10% were prepared through a combustion technique. The powders were only slightly agglomerated and the size of crystallites were about 30nm. Some of the powders were co-doped with Mg, Ca, Sr, Ba, La of various concentrations. Such powders were cold-pressed and sintered at 1750°C for 5h in vacuum. X-ray-excited luminescence spectra of both the powders and the sintered ceramics were recorded and the efficiency was compared to the commercial standard Gd ₂ O ₂ S:Pr,Ce,F X-ray phosphor. It was found that the nanocrystalline powders of Lu ₂ O ₃ :Eu,Ca emit photons four-times less than the commercial micron-sized Gd ₂ O ₂ S:Pr,Ce,F powder. In the case of sintered materials the emission efficiency from our Lu ₂ O ₃ :Eu5%, Ca was roughly equal to the efficiency of the commercial-sintered Gd ₂ O ₂ S:Pr,Ce,F. The co-doping ions were shown to have various effects on the transparency of the sintered Lu ₂ O ₃ :Eu. Mg hindered the sintering process producing completely opaque pellets. Other ions facilitated the sintering course and the best results were obtained by co-doping the samples with 0.5% of Ba. Sr and La also significantly stimulated the sintering and the final pellets were only slightly cloudy.

Lu2O3, Luminescence, Radioluminescence, X-ray phosphor

http://doi.org./ 10.1016/j.radmeas.2004.03.027