UV-Blue and Green Electroluminescence from Cu-Doped ZnO Nanorod Emitters Hydrothermally Synthesized on p-GaN
Aqueous solution synthesis of ZnO nanorods on p-GaN(0001) is a low-temperature (<100 °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.
Keywords: CU–ZNO NANORODS; EPITAXY; GREEN EMISSION; HYDROTHERMAL; PHOTOLUMINESCENCE; UV-LIGHT EMITTING DIODE; ZNO; ZNO/P-GAN HETEROJUNCTION
Document Type: Research Article
Publication date: 01 December 2012
- Journal of Nanoelectronics and Optoelectronics (JNO) is an international and cross-disciplinary peer reviewed journal to consolidate emerging experimental and theoretical research activities in the areas of nanoscale electronic and optoelectronic materials and devices into a single and unique reference source. JNO aims to facilitate the dissemination of interdisciplinary research results in the inter-related and converging fields of nanoelectronics and optoelectronics.
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