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- Title
Preparation and Scintillating Properties of Sol-Gel Eu<sup>3+</sup>, Tb<sup>3+</sup> Co-Doped Lu<sub>2</sub>O<sub>3</sub> Nanopowders.
- Authors
de Jesús Morales Ramírez, Ángel; Murillo, Antonieta García; de Jesús Carrillo Romo, Felipe; Hernández, Margarita García; Palmerin, Joel Moreno; Guerrero, Rosario Ruiz
- Abstract
Nanocrystalline Eu3+, Tb3+ co-doped Lu2O3 powders with a maximum size of 25.5 nm were prepared by the sol-gel process, using lutetium, europium and terbium nitrates as precursors, and ethanol as a solvent. Differential thermal analysis (DTA) and infrared spectroscopy (IR) were used to study the chemical changes during the xerogel annealing. After the sol evaporation at 100 °C, the formed gel was annealed from 300 to 900 °C for 30 min under a rich O2 atmosphere, and the yielded product was analyzed by X-ray diffraction (XRD) to characterize the microstructural behavior and confirm the crystalline structure. The results showed that Lu2O3 nanopowders start to crystallize at 400 °C and that the crystallite size increases along with the annealing temperature. A transmission electron microscopy (TEM) study of samples annealed at 700 and 900 °C was carried out in order to analyze the microstructure, as well as the size, of crystallites. Finally, in regard to scintillating properties, Eu3+ dopant (5 mol%), Tb3+ codoped Lu2O3 exhibited a typical red emission at 611 nm (Do→7F2), furthermore, the effect of Tb3+ molar content (0.01, 0.015 and 0.02% mol) on the Eu3+ radioluminiscence was analyzed and it was found that the higher emission intensity corresponds to the lower Tb3+ content.
- Subjects
NANOCRYSTALS; SCINTILLATION spectrometry; THERMAL analysis; TRANSMISSION electron microscopy; X-ray diffraction; INFRARED spectroscopy
- Publication
International Journal of Molecular Sciences, 2011, Vol 12, Issue 9, p6240
- ISSN
1661-6596
- Publication type
Article
- DOI
10.3390/ijms12096240