Resumen

MARISCAL-BECERRA, L. et al. Luminescent characteristics of Eu²⁺/Li⁺ doped (La-Al)₂O₃ phosphors and PMMA films activated with them. Rev. mex. fis. [online]. 2018, vol.64, n.5, pp.447-455.  Epub 30-Nov-2019. ISSN 0035-001X.

The effect of Li co-doping on the blue luminescence of Eu2+ doped (La-Al)2 O3 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 O3 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.

Palabras llave : Eu²⁺ blue emission; lithium effect; PMMA composite films; 42; 42.70.-a; 81; 81.10.St.

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