Photoluminescence properties of heat-treated porous alumina films formed in oxalic acid |
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Authors: | I. Vrublevsky K. Chernyakova A. Bund A. Dubavik |
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Affiliation: | a Belarusian State University of Informatics and Radioelectronics Minsk, Department of Micro and Nanoelectronics, 220013 Minsk, Belarus b Technische Universität Dresden, Physikalische Chemie und Elektrochemie, 01062 Dresden, Germany |
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Abstract: | Photoluminescence and optical properties of as-anodized and heat-treated at 500 °C porous alumina films formed in a 0.3 M oxalic acid at 40 V have been studied. The FTIR indicates that the oxalate ions are embedded in the anodic alumina as chelating bidentate structures and further heating up to 500 °C does not cause any change in ion coordination. The results of time-resolved spectroscopy show the presence of two luminescence centers both in the as-anodized and heat-treated anodic alumina films with lifetimes of about 0.25 and 4.0 ns. The F+-centers in anodic alumina are responsible for the luminescence peak at about 420 nm, with a lifetime of about 4.0 ns. The luminescence peak at about 480 nm, with lifetime of about 0.25 ns, can be attributed to the luminescence of carboxylate ions existing in bulk of anodic alumina. |
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Keywords: | Porous alumina Photoluminescence spectroscopy Fourier transform infrared spectroscopy (FTIR) Lifetime of luminescence centers |
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