Luminescent characteristics of Eu2+/Li+ doped (La-Al)2O3 phosphors and PMMA films activated with them

L. Mariscal-Becerra, S. Carmona-Téllez, G. Alarcón-Flores, J. U. Balderas-Aguilar, R. Vázquez-Arreguín, H. Murrieta, C. Falcony

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

2 Citas (Scopus)

Resumen

The effect of Li co-doping on the blue luminescence of Eu2+ doped (La-Al)2O3 phosphors and its incorporation into poly (methyl methacrylate) PMMA films are reported. The phosphors were synthesized by a simple two-step process in which the (La-Al)2O3 powders were obtained by an evaporation method, and the subsequent co-doping with Li+ and Eu2+ were made through a solid state reaction in a reductive atmosphere at 1250°C. The incorporation of those phosphors into PMMA matrix and the synthesis of films with thicknesses between 6 and 12 μm was made by drop-casting. The characteristic blue broad band emission centered at 440 nm associated with the 4f65d1 →4F7 transition of Eu2+ ions (CIE coordinates 0.6731, 0.3343) was observed when these powders were excited with 297 nm light. These luminescence intensity was enhanced when Li+ was incorporated as co-dopant up to 320% with respect to those phosphors without Lithium. The luminescent characteristics of these phosphors were preserved when they were embedded into the PMMA films.

Idioma originalInglés
Páginas (desde-hasta)447-455
Número de páginas9
PublicaciónRevista Mexicana de Fisica
Volumen64
N.º5
DOI
EstadoPublicada - 2018

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