The photoluminescence properties of undoped and Ce-doped ZnO thin films that were prepared by DC magnetron sputtering were investigated. It was found that the incorporation of Ce could intensively affect the structural, optical, and photoluminescence properties of the ZnO thin films. The undoped ZnO thin films showed a sharp UV luminescence, whereas the Ce-doped ZnO thin films showed a broad blue luminescence. The effects of excitation wavelength and annealing atmosphere on the photoluminescence properties of Ce-doped ZnO thin films were also studied. After post-annealing in air and oxygen atmospheres, the blue emissions of the prepared films were drastically suppressed. Our results indicate that the blue emissions of Ce-doped ZnO thin films are related to zinc interstitials and the intrinsic transition of Ce3+ ions.National Science Foundation of China [50825101, 50971108, 51171158]; Fundamental Research Funds for the Central Universities [201112G015

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National Outstanding Youth Science Foundation of China [50825101]; National Natural Science Foundation of China [50671087]Highly ordered arrays of parallel Fe(70)Co(30) nanowires with a diameter of about 50 nm and a length up to about several tens of micrometers were synthesized by two electrical fields in an anodized aluminum oxide film. The magnetic properties in the temperature range from 5 to 300 K were studied. When the applied field is along the long axis, the temperature dependence of coercivity of Fe(70)Co(30) nanowire arrays shows a linear decrease with temperature increasing, which can be understood by a phenomenological nucleate model. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3103775

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