Dynamic characteristics of the exciton and the biexciton in a single InGaN quantum dot

The dynamics of the exciton and the biexciton related emission from a single InGaN quantum dot (QD) have been measured by time-resolved microphotoluminescence spectroscopy. An exciton-biexciton pair of the same QD was identified by the combination of power dependence and polarization-resolved spectr...

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Bibliographic Details
Published in:Applied physics letters 2012-08, Vol.101 (6), p.61910
Main Authors: Amloy, S., Moskalenko, E. S., Eriksson, M., Karlsson, K. F., Chen, Y. T., Chen, K. H., Hsu, H. C., Hsiao, C. L., Chen, L. C., Holtz, P. O.
Format: Article
Language:English
Subjects:
Emission spectroscopy
Excitation
Excitation spectra
Indium gallium nitrides
Quantum dots
Spectra
Spectroscopy
TECHNOLOGY
TEKNIKVETENSKAP
Trions
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Summary:The dynamics of the exciton and the biexciton related emission from a single InGaN quantum dot (QD) have been measured by time-resolved microphotoluminescence spectroscopy. An exciton-biexciton pair of the same QD was identified by the combination of power dependence and polarization-resolved spectroscopy. Moreover, the spectral temperature evolution was utilized in order to distinguish the biexciton from a trion. Both the exciton and the biexciton related emission reveal mono-exponential decays corresponding to time constants of similar to 900 and similar to 500 ps, respectively. The obtained lifetime ratio of similar to 1.8 indicates that the QD is small, with a size comparable to the exciton Bohr radius.
ISSN:0003-6951
1077-3118
1077-3118
DOI:10.1063/1.4742343