Eu-doped ZnO nanowire arrays grown by electrodeposition

    Authors

    O. Lupan; T. Pauporte; B. Viana; P. Aschehoug; M. Ahmadi; B. R. Cuenya; Y. Rudzevich; Y. Lin;L. Chow

    Comments

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    Abbreviated Journal Title

    Appl. Surf. Sci.

    Keywords

    ZnO; Europium doping; Nanowires; Electrodeposition; Photoluminescence; EFFICIENT ENERGY-TRANSFER; EU3+-DOPED ZNO; ZINC-OXIDE; LUMINESCENCE; PROPERTIES; RAMAN-SPECTROSCOPY; ROOM-TEMPERATURE; FILMS; PHOTOLUMINESCENCE; NANORODS; PHOSPHOR; Chemistry, Physical; Materials Science, Coatings & Films; Physics, ; Applied; Physics, Condensed Matter

    Abstract

    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 SnO2. 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 Zn2+ 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 D-5(0)-F-7(2) transition of the Eu3+ 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. (C) 2013 Elsevier B.V. All rights reserved.

    Journal Title

    Applied Surface Science

    Volume

    282

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    782

    Last Page

    788

    WOS Identifier

    WOS:000322314800118

    ISSN

    0169-4332

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