Photoluminescence studies of exciton recombination and dephasing in single InGaN quantum dots

Author

Rice, James H. ; Robinson, James W. ; Smith, Jonathan D. ; Jarjour, Anas ; Taylor, Robert A. ; Oliver, Rachel A. ; Briggs, G.Andrew D. ; Kappers, Menno J. ; Yasin, Shazia ; Humphreys, Colin J.

Author_Institution

Dept. of Phys., Univ. of Oxford, UK

Volume

3

Issue

3

fYear

2004

Firstpage

343

Lastpage

347

Abstract

This paper reports on time-integrated and time-resolved microphotoluminescence (μ-PL) measurements of single InGaN quantum dots (QDs). The linewidths of the μ-PL peaks originating from single metal-organic vapor phase epitaxy-grown III/V InGaN QDs are measured, implying dephasing times of at least 5 ps. Temporal fluctuations of the QD emission energy are observed, and these are explained in terms of randomly generated local electric fields inducing a Stark shift in the optical emission of the InGaN QDs. Time-resolved measurements demonstrate that decay dynamics from single InGaN QDs are exponential in nature. Measurements of the effect of temperature upon the recombination times in individual InGaN QDs have been performed from 4 to 60 K.

Keywords

III-V semiconductors; Stark effect; excitons; gallium compounds; indium compounds; nonradiative transitions; photoluminescence; semiconductor epitaxial layers; semiconductor quantum dots; time resolved spectra; vapour deposited coatings; wide band gap semiconductors; 4 to 60 K; 5 ps; InGaN; QD emission energy; Stark shift; decay dynamics; dephasing; exciton recombination; metalorganic vapor phase epitaxial growth; optical emission; photoluminescence; randomly generated local electric fields; single InGaN quantum dots; temporal fluctuations; time integrated microphotoluminescence; time resolved measurements; time resolved microphotoluminescence; Excitons; Nanostructures; Optical control; Photoluminescence; Physics; Quantum computing; Quantum dots; Radiative recombination; US Department of Transportation; Ultrafast optics; Excitons; PL; QDs; information technology; nanotechnology; optical spectroscopy; photoluminescence; quantum dots;

fLanguage

English

Journal_Title

Nanotechnology, IEEE Transactions on

Publisher

ieee

ISSN

1536-125X

Type

jour

DOI

10.1109/TNANO.2004.828567

Filename

1331322