Multi-wavelength emission from a single InGaN/GaN nanorod analyzed by cathodoluminescence hyperspectral imaging

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Date
2018
Authors
Kusch, Gunnar
Conroy, Michele
Li, Haoning
Edwards, Paul R.
Zhao, Chao
Ooi, Boon S.
Pugh, Jon
Cryan, Martin J.
Parbrook, Peter J.
Martin, Robert W.
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Nature Publishing Group
Published Version
10.1038/s41598-018-20142-5
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Abstract
Multiple luminescence peaks emitted by a single InGaN/GaN quantum-well(QW) nanorod, extending from the blue to the red, were analysed by a combination of electron microscope based imaging techniques. Utilizing the capability of cathodoluminescence hyperspectral imaging it was possible to investigate spatial variations in the luminescence properties on a nanoscale. The high optical quality of a single GaN nanorod was demonstrated, evidenced by a narrow band-edge peak and the absence of any luminescence associated with the yellow defect band. Additionally two spatially confined broad luminescence bands were observed, consisting of multiple peaks ranging from 395 nm to 480 nm and 490 nm to 650 nm. The lower energy band originates from broad c-plane QWs located at the apex of the nanorod and the higher energy band from the semipolar QWs on the pyramidal nanorod tip. Comparing the experimentally observed peak positions with peak positions obtained from plane wave modelling and 3D finite difference time domain(FDTD) modelling shows modulation of the nanorod luminescence by cavity modes. By studying the influence of these modes we demonstrate that this can be exploited as an additional parameter in engineering the emission profile of LEDs.
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Keywords
Whispering-gallery modes , GaN rods , Nitride , Nanostructures , Polaritons , Microscopy , Arrays
Citation
Kusch, G., Conroy, M., Li, H., Edwards, P. R., Zhao, C., Ooi, B. S., Pugh, J., Cryan, M. J., Parbrook, P. J. and Martin, R. W. (2018) 'Multi-wavelength emission from a single InGaN/GaN nanorod analyzed by cathodoluminescence hyperspectral imaging', Scientific Reports, 8(1), 1742 (8pp). doi: 10.1038/s41598-018-20142-5
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https://www.nature.com/articles/s41598-018-20142-5
URI
https://hdl.handle.net/10468/6348
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Tyndall National Institute - Journal Articles
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© 2018, the Authors. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Te images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.