Site controlled red-yellow-green light emitting InGaN quantum discs on nano-tipped GaN rods

M. Conroy, H. Li, G. Kusch, C. Zhao, B. Ooi, P. R. Edwards, R. W. Martin, J. D. Holmes, P. J. Parbrook

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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.
LanguageEnglish
Pages11019-11026
Number of pages8
JournalNanoscale
Volume8
Issue number21
Early online date10 Mar 2016
DOIs
Publication statusPublished - 26 May 2016

Fingerprint

Methyl Green
Nanorods
Coalescence
Organic Chemicals
Strain relaxation
Site selection
Cathodoluminescence
Organic chemicals
Light sources
Chemical vapor deposition
Metals
Transmission electron microscopy
X rays
Defects
Crystals
Scanning electron microscopy

Keywords

  • InGaN quantum discs
  • nano-tipped GaN rods
  • nanorods
  • electron microscopy
  • energy-dispersive x-ray
  • cathodoluminescence

Cite this

Conroy, M., Li, H., Kusch, G., Zhao, C., Ooi, B., Edwards, P. R., ... Parbrook, P. J. (2016). Site controlled red-yellow-green light emitting InGaN quantum discs on nano-tipped GaN rods. Nanoscale, 8(21), 11019-11026. https://doi.org/10.1039/c6nr00116e
Conroy, M. ; Li, H. ; Kusch, G. ; Zhao, C. ; Ooi, B. ; Edwards, P. R. ; Martin, R. W. ; Holmes, J. D. ; Parbrook, P. J. / Site controlled red-yellow-green light emitting InGaN quantum discs on nano-tipped GaN rods. In: Nanoscale. 2016 ; Vol. 8, No. 21. pp. 11019-11026.
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abstract = "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.",
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Conroy, M, Li, H, Kusch, G, Zhao, C, Ooi, B, Edwards, PR, Martin, RW, Holmes, JD & Parbrook, PJ 2016, 'Site controlled red-yellow-green light emitting InGaN quantum discs on nano-tipped GaN rods' Nanoscale, vol. 8, no. 21, pp. 11019-11026. https://doi.org/10.1039/c6nr00116e

Site controlled red-yellow-green light emitting InGaN quantum discs on nano-tipped GaN rods. / Conroy, M.; Li, H.; Kusch, G.; Zhao, C.; Ooi, B.; Edwards, P. R.; Martin, R. W.; Holmes, J. D.; Parbrook, P. J.

In: Nanoscale, Vol. 8, No. 21, 26.05.2016, p. 11019-11026.

Research output: Contribution to journalArticle

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T1 - Site controlled red-yellow-green light emitting InGaN quantum discs on nano-tipped GaN rods

AU - Conroy, M.

AU - Li, H.

AU - Kusch, G.

AU - Zhao, C.

AU - Ooi, B.

AU - Edwards, P. R.

AU - Martin, R. W.

AU - Holmes, J. D.

AU - Parbrook, P. J.

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