Cathodoluminescent characteristics of Sm-doped ZnAl 2O 4 nanostructured powders
Por:
Martinez-Sanchez E., Garcia-Hipolito M., Guzman J., Ramos-Brito F., Santoyo-Salazar J., Martinez-Martinez R., Alvarez-Fregoso O., Ramos-Cortes M.I., Mendez-Delgado J.J., Falcony C.
Publicada:
1 ene 2005
Resumen:
Cathodoluminescent (CL) powders of zinc aluminate activated with samarium ions have been prepared by a co-precipitation chemical process. Different doping concentrations in the start mixture and sintering temperatures for the precipitated powder were studied. It was observed that the crystalline characteristics of the powders depend upon the sintering temperature. For temperatures higher than 450°C, the powders presented the cubic spinel phase with a lattice parameter value of 8.0756 Å, and grain sizes from 50 to 100 nm with semispherical shape. The CL emission spectra showed broad bands localized at 564, 602, 644, and 703 nm associated with 4G 5/2 ? 6H 5/2, 4G 5/2 ? 6H 7/2, 4G 5/2 ? 6H 9/2 and 4G 5/2 ? 6H 11/2 transitions in the Sm 3+ ions, respectively. Concentration quenching of the cathodoluminescence occurred at about 4.26 at% of the activator (Sm) concentration inside the sintered powders. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Filiaciones:
Martinez-Sanchez E.:
Instituto de Investigaciones en Materiales, UNAM, Apdo. Postal 70-360, Mexico D.F., Coyoacan 04510, Mexico
Garcia-Hipolito M.:
Instituto de Investigaciones en Materiales, UNAM, Apdo. Postal 70-360, Mexico D.F., Coyoacan 04510, Mexico
Guzman J.:
Instituto de Investigaciones en Materiales, UNAM, Apdo. Postal 70-360, Mexico D.F., Coyoacan 04510, Mexico
Ramos-Brito F.:
Instituto de Investigaciones en Materiales, UNAM, Apdo. Postal 70-360, Mexico D.F., Coyoacan 04510, Mexico
Santoyo-Salazar J.:
Instituto de Investigaciones en Materiales, UNAM, Apdo. Postal 70-360, Mexico D.F., Coyoacan 04510, Mexico
Martinez-Martinez R.:
Instituto de Investigaciones en Materiales, UNAM, Apdo. Postal 70-360, Mexico D.F., Coyoacan 04510, Mexico
Alvarez-Fregoso O.:
Instituto de Investigaciones en Materiales, UNAM, Apdo. Postal 70-360, Mexico D.F., Coyoacan 04510, Mexico
Ramos-Cortes M.I.:
Departamento de Física, CINVESTAV-IPN, Apdo. Postal 14-740, 07000, México D.F., Mexico
Mendez-Delgado J.J.:
Departamento de Física, CINVESTAV-IPN, Apdo. Postal 14-740, 07000, México D.F., Mexico
Falcony C.:
Departamento de Física, CINVESTAV-IPN, Apdo. Postal 14-740, 07000, México D.F., Mexico
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