Luminescent characteristics of Eu2+/Li+ doped (La-Al)(2)O-3 phosphors and PMMA films activated with them
Por:
Mariscal-Becerra, L., Carmona-Tellez, S., Alarcon-Flores, G., Balderas-Aguilar, J. U., Vazquez-Arreguin, R., Murrieta, H., Falcony, C.
Publicada:
1 sep 2018
Resumen:
The effect of Li co-doping on the blue luminescence of Eu2+ doped
(La-Al)(2)O-3 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)(2)O-3 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 degrees C. The incorporation of those phosphors into
PMMA matrix and the synthesis of films with thicknesses between 6 and 12
pm was made by drop-casting. The characteristic blue broad band emission
centered at 440 nm associated with the 4f(6)5d(1)-> 4F(7) 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.
Filiaciones:
Univ Nacl Autonoma Mexico, Inst Fis, Circuito Invest Cient, Ciudad Univ Coyoacan, Mexico City 04510, DF, Mexico
IPN, Dept Fis, Ctr Invest & Estudios Avanzados, Ave Inst Politecn Nacl 2508 San Pedro Zacatenco, Gustavo A Madero 07360, Mexico
Inst Politecn Nacl, Ctr Invest Ciencia Aplicada & Tecnol Avanzada, Unidad Legaria, Calzada Legaria 694, Irrigacion 11500, Miguel Hidalgo, Mexico
IPN, Ctr Invest & Estudios Avanzados, Programa Doctorado Nanociencias & Nanotecnol, Ave Inst Politecn Nacl 2508 San Pedro Zacatenco, Gustavo A Madero 07360, Mexico
Inst Politecn Nacl, Ave Juan de Dios Batiz Esq Ave Miguel Othon De, Lindavista 07738, Gustavo A Mader, Mexico
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