Otro
Structural and optical properties of Er3+ doped SiO2-Al2O3-GeO2 compounds prepared by a simple route
Registro en:
Materials Science And Engineering B-advanced Functional Solid-state Materials, v. 194, p. 21-26, 2015.
0921-5107
WOS:000350091600004
Autor
Faria Filho, Fausto M.
Goncalves, Rogeria R.
Ribeiro, Sidney J. L.
Maia, Lauro J. Q.
Resumen
Samples of (1 - x)[0.70SiO(2) + 0.30Al(2)O(3)] + xGeO(2) compositions, containing x = 0.05, 0.10, 0.20, 0.30, 0.40 and 0.50, and doped with 1 mol% of Er3+, were prepared by a mixed route (sol gel process and Pechini method). Transparent gels were synthesized and homogeneous powders were obtained by heat treatments from 800 degrees C to 1050 degrees C. The final powders were characterized by X-ray diffraction, Fourier transform infrared spectroscopy and high-resolution transmission electron microscopy. The optical properties were studied by photoluminescence measurements in the infrared region, and the average lifetime of the metastable state I-4(13/2) of Er3+ ions and the full-width at half maximum (FWHM) were determined. A silica-rich amorphous phase and nanocrystallites with orthorhombic structure of Al6Ge2O13 phase were obtained. The samples present a broad emission centered at around 1532 nm under excitation at 977 nm, with a FWHM of 53 nm and a lifetime of 5.6 ms. The synthesized compounds by an easy chemical procedure are potentially applicable in integrated optical systems. (C) 2015 Elsevier B.V. All rights reserved. Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)