UV-Blue and Green Electroluminescence from Cu-Doped ZnO Nanorod Emitters Hydrothermally Synthesized on p-GaN
Abbreviated Journal Title
J. Nanoelectron. Optoelectron.
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
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 of Nanoelectronics and Optoelectronics
"UV-Blue and Green Electroluminescence from Cu-Doped ZnO Nanorod Emitters Hydrothermally Synthesized on p-GaN" (2012). Faculty Bibliography 2010s. 2977.