Site controlled Red-Yellow-Green light emitting InGaN Quantum Discs on nano-tipped GaN rods

Michele Ann Conroy, Haoning Li, Gunnar Kusch, Chao Zhao, Boon S. Ooi, Edwards Paul, Robert W. Martin, Justin D. Holmes, Peter Parbrook

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


We report a method of growing site controlled InGaN multiple quantum discs (QDs) at uniform wafer scale on coalescence free ultra-high density (>80%) nanorod templates by metal organic chemical vapour deposition (MOCVD). The dislocation and coalescence free nature of the GaN space filling nanorod arrays eliminates the well-known emission problems seen in InGaN based visible light sources that these types of crystallographic defects cause. Correlative scanning transmission electron microscopy (STEM), energy-dispersive x-ray (EDX) mapping and cathodoluminescence (CL) hyperspectral imaging illustrates the controlled site selection of the red, yellow and green (RYG) emission at these nano tips. This article reveals that the nanorod tips’ broad emission in the RYG visible range is in fact achieved by manipulating the InGaN QD’s confinement dimensions, rather than significantly increasing the In%. This article details the easily controlled method of manipulating the QDs dimensions producing high crystal quality InGaN without complicated growth conditions needed for strain relaxation and alloy compositional changes seen for bulk planar GaN templates.
Original languageEnglish (US)
Pages (from-to)11019-11026
Number of pages8
Issue number21
StatePublished - 2016

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This research was enabled by the Irish Higher Education
Authority Programme for Research in Third Level Institutions
Cycles 4 and 5 via the INSPIRE and TYFFANI projects, and by
Science Foundation Ireland (SFI) under Grant no.
SFI/10/IN.1/I2993. PJP acknowledges funding from SFI
Engineering Professorship scheme (07/EN/E001A) and MC
acknowledges PhD research scholarship from INSPIRE. This
work was conducted under the framework of the Irish
Government's Programme for Research in Third Level
Institutions Cycle 5, National Development Plan 2007–2013
with the assistance of the European Regional Development
Fund. RWM and GK acknowledge funding from the Engineering
and Physical Sciences Research Council (EPSRC)
(EP/M003132/1) of the UK. We also acknowledge the support
of Duc V. Dinh for his help with the PL spectra and William Jagoe
for his illustrations in the article.


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