Síntesis y propiedades ópticas de los materiales la3po7 y la7p3o18 dopados con sm3+, yb3+ y er3+
Fosfatos de Lantano fueron sintetizados satisfactoriamente en la presente investigación por el método del estado sólido, 2 fases fueron ensayadas, un fosfato sintetizado a alta temperatura La7P3O18 (FL-HT) y un fosfato sintetizado a baja temperatura La3PO7 (FL-BT). Luego de confirmar su pureza, los...
- Autores:
-
Gomez Torres, Maria Alejandra
- Tipo de recurso:
- http://purl.org/coar/version/c_b1a7d7d4d402bcce
- Fecha de publicación:
- 2016
- Institución:
- Universidad Industrial de Santander
- Repositorio:
- Repositorio UIS
- Idioma:
- spa
- OAI Identifier:
- oai:noesis.uis.edu.co:20.500.14071/34320
- Palabra clave:
- Materiales
Fosfatos
Tierras Raras
Dopante
Luminiscencia
Propiedades Ópticas
Ancho De Banda Prohibido
Espectroscopía.
Lanthanum phosphates were successfully synthesized in this investigation by a solid state reaction. 2 phases were tested
a high temperature phosphate La7P3O18 (FL-HT) and a low temperature phosphate La3PO7 (FL-BT). After confirming its purity
the Lanthanum phosphates were doped with 2
5 and 10% of rare earth oxides named below: Sm2O3
Yb2O3
Er2O3. These rare earth oxides were chosen based on results reported in previous researches and precursors availability. The high temperature phase has a monoclinic structure and space group P21/n while the low temperature phase has the same structure and Cm space group. The samples were studied using different analytical techniques
primarily
by X-ray diffraction (DRX) to confirm the presence of the desired phases; the undoped matrices and the doped FL-HT materials were found pure. On the other hand
in order to analyze whether there is an evolution in the material optical properties
the synthesized samples were tested by UV-visible diffuse reflectance Spectroscopy. The results were dealt with the Kubelka-Munk method and the Tauc’s model for subsequent determination of the bandgap. A reduction in the bandgap value was observed in samples doped with samarium oxide based on the increase in the dopant percentage. Emission and Excitation specters were observed as a result of the fluorescence Spectrometry
the results show interesting bands in the samarium oxide doped samples spectra (FL-HT)
it was observed that this dopant emits red under UV excitation. The peaks were indexed and potential applications as luminescent material were glimpsed.
- Rights
- License
- Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)