Journal
LASER & PHOTONICS REVIEWS
Volume 8, Issue 3, Pages 429-435Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.201300172
Keywords
bandgap engineering; light-emitting diode; ZnO Nanowires; tunable emission; gallium doping
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Funding
- National Natural Science Foundation of China [11074082, 11204093, 51002056, 11374110, 11304106, 51371085]
- National Basic Research Program of China [2011CB933300]
- Foundation for the Author of National Excellent Doctoral Dissertation of China [201035]
- 'the Fundamental Research Funds for the Central Universities', HUST [2012QN114, 2013TS033]
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Wavelength-tunable light-emitting diodes (LEDs) of GaxZn1-xO nanowire arrays are demonstrated by a simple modified chemical vapor deposition heteroepitaxial growth on p-GaN substrate. As a gallium atom has similar electronegativity and ion radius to a zinc atom, high-level Ga-doped GaxZn1-xO nanowire arrays have been fabricated. As the xvalue gradually increases from 0 to 0.66, the near-band-edge emission peak of GaxZn1-xO nanowires shows a significant shift from 378 nm (3.28 eV) to 418 nm (2.96 eV) in room-temperature photoluminescence (PL) measurement. Importantly, the electroluminescence (EL) emission of GaxZn1-xO nanowire arrays LED continuously shifts with a wider range (approximate to 100 nm), from the ultraviolet (382 nm) to the visible (480 nm) spectral region. The presented work demonstrates the possibility of bandgap engineering of low-dimensional ZnO nanowires by gallium doping and the potential application for wavelength-tunable LEDs.
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