Optical properties of GaN nanorods containing a single or multiple InGaN quantum wells

Yi D. Zhuang, Szymon Lis, Jochen Bruckbauer, Simon E. J. O'Kane, Philip A. Shields, Paul R. Edwards, Jayanta Sarma, Robert W. Martin, Duncan W. E. Allsopp

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Measurements of light emission from GaN nanorods of diameter between 80 and 350 nm, containing either a three-well multiple InGaN quantum well or a single quantum well, have been performed by photoluminescence (PL) and cathodoluminescence (CL) hyperspectral imaging. The PL underwent a Stark shift to the blue as the nanorod diameter was reduced, indicating substantial relaxation of the compressive strain in the quantum wells. The intensity of the nanorod emission per unit area can exceed that of the planar starting material. The CL measurements revealed that the wavelength of the quantum well emission varied with radial position in the nanorod. Simulations by a modal expansion method revealed that the light extraction efficiency varies with radial position and the variation is dependent on nanorod diameter. Finite difference time domain simulations showed that Bloch mode formation in the buffer layer below the nanorods impacts on the light extraction.
LanguageEnglish
Article number08JE11
Number of pages5
JournalJapanese Journal of Applied Physics
Volume52
DOIs
Publication statusPublished - 20 May 2013

Fingerprint

Nanorods
Semiconductor quantum wells
nanorods
Optical properties
quantum wells
optical properties
Cathodoluminescence
cathodoluminescence
Photoluminescence
photoluminescence
Light emission
Buffer layers
light emission
simulation
buffers
Wavelength
expansion
shift
wavelengths

Keywords

  • optical properties
  • GaN nanorods
  • InGaN quantum wells
  • photoluminescence
  • cathodoluminescence

Cite this

Zhuang, Yi D. ; Lis, Szymon ; Bruckbauer, Jochen ; O'Kane, Simon E. J. ; Shields, Philip A. ; Edwards, Paul R. ; Sarma, Jayanta ; Martin, Robert W. ; Allsopp, Duncan W. E. / Optical properties of GaN nanorods containing a single or multiple InGaN quantum wells. In: Japanese Journal of Applied Physics. 2013 ; Vol. 52.
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abstract = "Measurements of light emission from GaN nanorods of diameter between 80 and 350 nm, containing either a three-well multiple InGaN quantum well or a single quantum well, have been performed by photoluminescence (PL) and cathodoluminescence (CL) hyperspectral imaging. The PL underwent a Stark shift to the blue as the nanorod diameter was reduced, indicating substantial relaxation of the compressive strain in the quantum wells. The intensity of the nanorod emission per unit area can exceed that of the planar starting material. The CL measurements revealed that the wavelength of the quantum well emission varied with radial position in the nanorod. Simulations by a modal expansion method revealed that the light extraction efficiency varies with radial position and the variation is dependent on nanorod diameter. Finite difference time domain simulations showed that Bloch mode formation in the buffer layer below the nanorods impacts on the light extraction.",
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Optical properties of GaN nanorods containing a single or multiple InGaN quantum wells. / Zhuang, Yi D.; Lis, Szymon; Bruckbauer, Jochen; O'Kane, Simon E. J.; Shields, Philip A.; Edwards, Paul R.; Sarma, Jayanta; Martin, Robert W.; Allsopp, Duncan W. E.

In: Japanese Journal of Applied Physics, Vol. 52, 08JE11, 20.05.2013.

Research output: Contribution to journalArticle

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T1 - Optical properties of GaN nanorods containing a single or multiple InGaN quantum wells

AU - Zhuang, Yi D.

AU - Lis, Szymon

AU - Bruckbauer, Jochen

AU - O'Kane, Simon E. J.

AU - Shields, Philip A.

AU - Edwards, Paul R.

AU - Sarma, Jayanta

AU - Martin, Robert W.

AU - Allsopp, Duncan W. E.

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Y1 - 2013/5/20

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AB - Measurements of light emission from GaN nanorods of diameter between 80 and 350 nm, containing either a three-well multiple InGaN quantum well or a single quantum well, have been performed by photoluminescence (PL) and cathodoluminescence (CL) hyperspectral imaging. The PL underwent a Stark shift to the blue as the nanorod diameter was reduced, indicating substantial relaxation of the compressive strain in the quantum wells. The intensity of the nanorod emission per unit area can exceed that of the planar starting material. The CL measurements revealed that the wavelength of the quantum well emission varied with radial position in the nanorod. Simulations by a modal expansion method revealed that the light extraction efficiency varies with radial position and the variation is dependent on nanorod diameter. Finite difference time domain simulations showed that Bloch mode formation in the buffer layer below the nanorods impacts on the light extraction.

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