Conţinutul numărului revistei |
Articolul precedent |
Articolul urmator |
169 0 |
SM ISO690:2012 LUPAN, Oleg, PAUPORTE, Thierry, VIANA, Bruno, ASCHEHOUG, Patrick, AHMADI, Mahdi, CUENYA, Beatriz Roldan, RUDZEVICH, Yauheni, LIN, Yuqing, CHOW, Lee. Eu-doped ZnO nanowire arrays grown by electrodeposition. In: Applied Surface Science, 2013, vol. 282, pp. 782-788. ISSN 0169-4332. DOI: https://doi.org/10.1016/j.apsusc.2013.06.053 |
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Applied Surface Science | |
Volumul 282 / 2013 / ISSN 0169-4332 | |
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DOI:https://doi.org/10.1016/j.apsusc.2013.06.053 | |
Pag. 782-788 | |
Rezumat | |
The preparation of efficient light emitting diodes requires active optical layers working at low voltage for light emission. Trivalent lanthanide doped wide-bandgap semiconducting oxide nanostructures are promising active materials in opto-electronic devices. In this work we report on the electrochemical deposition (ECD) of Eu-doped ZnO (ZnO:Eu) nanowire arrays on glass substrates coated with F-doped polycrystalline SnO 2 . The structural, chemical and optical properties of ZnO:Eu nanowires have been systematically characterized by X-ray diffraction, transmission electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, secondary ion mass spectrometry, and photoluminescence. XRD results suggest the substitution of Zn 2+ by Eu ions in the crystalline lattice. High-resolution TEM and associated electron diffraction studies indicate an interplanar spacing of 0.52 nm which corresponds to the (0 0 0 1) crystal plane of the hexagonal ZnO, and a growth along the c-direction. The ZnO:Eu nanowires have a single crystal structure, without noticeable defects. According to EDX, SIMS and XPS studies, cationic Eu species are detected in these samples showing the incorporation of Eu into the ZnO matrix. The oxidation states of europium ions in the nanowires are determined as +3 (74%) and +2 (26%). Photoluminescence studies demonstrated red emission from the Eu-doped ZnO nanowire arrays. When Eu was incorporated during the nanowire growth, the sharp 5 D 0 - 7 F 2 transition of the Eu 3+ ion at around 612 nm was observed. These results suggest that Eu doped ZnO nanowires could pave the way for efficient, multispectral LEDs and optical devices |
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Cuvinte-cheie Electrodeposition, Europium doping, nanowires, photoluminescence, ZnO |
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