Dy Nanocrystals Research Articles

Thermoluminescence dosimetry properties of calcium and dysprosium activated zinc gallate nanocrystals

The ZnGa2O4:Ca and ZnGa2O4:Dy nanocrystals are synthesized by sol-gel method and their thermoluminescence and dosimetric characteristics have been investigated. The main TL glow peaks of ZnGa2O4:Ca and ZnGa2O4:Dy are observed at about 180 °C and 200 °C, respectively. The molar ratio of both dopants (Ca and Dy) was varied from 1 mol% to 9 mol%. It was found that the optimum concentration of both dopants is about 2 mol%, where the sensitivity of ZnGa2O4:Dy nano particles is 1.5 times higher than ZnGa2O4:Ca samples. Moreover, the linearity dose response of dosimetric peak follows a good linearity up to 5 kGy in both activated nanocrystals. The results of presented nanophosphors suggest the good candidates towards dosimetric applications.

Combustion synthesis of three-dimensional reticular-structured luminescence SrAl 2O 4:Eu,Dy nanocrystals

Three-dimensional reticular-structured luminescence SrAl 2O 4:Eu,Dy powders were prepared by refluxing- and sonication-combustion synthesis without using any surfactant for the first time and were characterized using X-ray diffraction, transmission electron microscopy, scanning electron microscopy. All the samples have a very porous, open and spongelike morphology with fractal properties. The excitation and emission spectra of the products have been measured by Edinburgh FLS920 at room temperature. The new formation-mechanism of the three-dimensional reticular-structure was proposed in this article.