Cathodoluminescent characteristics of Sm‐doped ZnAl 2 O 4 nanostructured powders
2004; Wiley; Volume: 202; Issue: 1 Linguagem: Inglês
10.1002/pssa.200406906
ISSN1862-6319
AutoresErika Martínez-Sánchez, M. Garcı́a-Hipólito, J. Guzmán, F. Ramos‐Brito, J. Santoyo‐Salazar, R. Martínez‐Martínez, O. Álvarez-Fregoso, M. I. Ramos‐Cortes, J. J. Mendez‐Delgado, C. Falcony,
Tópico(s)Glass properties and applications
ResumoAbstract 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 4 G 5/2 → 6 H 5/2 , 4 G 5/2 → 6 H 7/2 , 4 G 5/2 → 6 H 9/2 , and 4 G 5/2 → 6 H 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)
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