| 光谱学与光谱分析 |
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| Effects of Different Annealing Conditions on the Photoluminescence of Nanoporous Alumina Film |
| XIE Ning, MA Kai-di, SHEN Yi-fan, WANG Qian* |
| School of Physics Science and Technology, Xinjiang University, Urumqi 830046, China |
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Abstract The nanoporous alumina films were prepared by two-step anodic oxidation in 0.5 mol·L-1 oxalic acid electrolyte at 40 V. Photoluminescence (PL) of nanoporous alumina films was investigated under different annealing atmosphere and different temperature. The authors got three results about the PL measurements. In the same annealing atmosphere, when the annealling temperature T≤600 ℃, the intensity of the PL peak increases with elevated annealing temperature and reaches a maximum value at 500 ℃, but the intensity decreases with a further increase in the annealing temperature, and the PL peak intensity of samples increases with the increase in the annealing temperature when the annealling temperature T≥800 ℃. In the different annealling atmosphere, the change in the photoluminescence peak position for nanoporous alumina films with the increase in the annealing temperature is different: With the increase in the annealling temperature, the PL peak position for the samples annealed in air atmosphere is blue shifted, while the PL peak position for the samples annealed in vacuum atmosphere will not change. The PL spectra of nanoporous alumina films annealed at 1 100 ℃ in air atmosphere can be de-convoluted by three Gaussian components at an excitation wavelength of 350 nm, with bands centered at 387，410 and 439 nm, respectively. These results suggest that there might be three luminescence centers for the PL of annealed alumina films. At the same annealling temperature, the PL peak intensity of samples annealed in air atmosphere is stronger than that annealed in the vacuum. Based on the experimental results and the X-ray dispersive energy spectrum (EDS) combined with infrared reflect spectra, the luminescence mechanisms of nanoporous alumina films are discussed. There are three luminescence centers in the annealed nanoporous alumina films, which originate from the F center, F+ center and the center associated with the oxalic impurities. The effects of different annealing conditions on the photoluminescence of nanoporous alumina film are reasonably explained.
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Received: 2013-07-09
Accepted: 2013-10-12
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Corresponding Authors:
WANG Qian
E-mail: wangqian0809@sina.com
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