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

• Mariscal-Becerra, L. ^[1] ; Carmona-Téllez, S. ^[2] ; Alarcón-Flores, G. ^[2] ; Balderas-Aguilar, J.U. ^[2] ; Vázquez-Arreguín, R. ^[2] ; Murrieta, H. ^[1] ; Falcony, C. ^[2]
  1. [1] Universidad Nacional Autónoma de México

     Universidad Nacional Autónoma de México

     México

     
  2. [2] Instituto Politécnico Nacional

     Instituto Politécnico Nacional

     México

     
• Localización: Revista Mexicana de Física, ISSN-e 0035-001X, Vol. 64, Nº. 5, 2018, págs. 447-455
• Idioma: inglés
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• Resumen

  • The effect of Li co-doping on the blue luminescence of Eu^(2+) 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 Eu^(2+) were made through a solid state reaction in a reductive atmosphere at 1250º 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 4f^(6)5d^(1)→ 4F^(7) transition of Eu^(2+) ions (CIE coordinates 0.6731, 0.3343) was observed when these powders were excited with 297nm light. These luminescence intensity was enhanced when Li was incorporated as co-dopant up to 320% with respect to those phosphors without Li. The luminescent characteristics of these phosphors were preserved when they were embedded into the PMMA films.