Luminescent characteristics of Eu2+/Li+ doped (La-Al)2O3 phosphors and PMMA films activated with them
Document title: Luminescent characteristics of Eu2+/Li+ doped (La-Al)2O3 phosphors and PMMA films activated with them
Journal: Revista mexicana de física
Database: PERIÓDICA
System number: 000460932
ISSN: 0035-001X
Authors: 1
2
2
3
2
1
2
Institutions: 1Universidad Nacional Autónoma de México, Instituto de Física, Ciudad de México. México
2Instituto Politécnico Nacional, Ciudad de México. México
3Instituto Politécnico Nacional, Centro de Investigación y de Estudios Avanzados, Ciudad de México. México
Year:
Season: Sep-Oct
Volumen: 64
Number: 5
Pages: 447-455
Country: México
Language: Inglés
Document type: Artículo
Approach: Analítico, teórico
English abstract 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
Disciplines: Física y astronomía
Keyword: Optica,
Luminiscencia,
Efecto Litio,
Láminas compuestas de PMMA
Keyword: Optics,
Luminescence,
Lithium effect,
PMMA composite films
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