UV-Blue and Green Electroluminescence from Cu-Doped ZnO Nanorod Emitters Hydrothermally Synthesized on p-GaN

    Authors

    O. Lupan; T. Pauporte; B. Viana; V. V. Ursaki; I. M. Tiginyanu; V. Sontea;L. Chow

    Comments

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    Abbreviated Journal Title

    J. Nanoelectron. Optoelectron.

    Keywords

    Cu-ZnO Nanorods; ZnO; Hydrothermal; Epitaxy; Photoluminescence; UV-Light; Emitting Diode; Green Emission; ZnO/p-GaN Heterojunction; ROOM-TEMPERATURE FERROMAGNETISM; ZINC-OXIDE; THIN-FILMS; COPPER; LUMINESCENCE; NANOWIRES; EFFICIENT; ARRAYS; FABRICATION; ULTRAVIOLET; Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied

    Abstract

    Aqueous solution synthesis of ZnO nanorods on p-GaN(0001) is a low-temperature ( < 100 degrees C) and cost-efficient growth technique of high quality emitters for LED applications. We present morphological, optical and structural properties of zinc oxide nanorod arrays grown by a hydrothermal seed layer-free and rapid synthesis (15 min) on p-GaN(0001). We found that the epitaxial layer possesses a close packed hexagonal nanorod morphology and lateral facets are oriented in the same direction for the various nanorods. The effect of Cu-doping on the optical and electroluminescence properties of Cu-ZnO nanorod arrays on GaN substrate is discussed in details. The UV/Blue and green (near-white) emissions were found in both photoluminescence and electroluminescence spectra indicating the possibility to use the synthesized Cu-ZnO/p-GaN hetero-structures in white LED applications. The emissions started at relatively low forward voltage of 4.9 V and the intensity of the emission increased with increasing the biasing voltage. We propose for further exploration an efficient, seed layer-free and low temperature hydrothermal synthesis technique to fabricate Cu-doped ZnO/p-GaN heterojunction light-emitting devices-LEDs.

    Journal Title

    Journal of Nanoelectronics and Optoelectronics

    Volume

    7

    Issue/Number

    7

    Publication Date

    1-1-2012

    Document Type

    Article

    Language

    English

    First Page

    712

    Last Page

    718

    WOS Identifier

    WOS:000315068300010

    ISSN

    1555-130X

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