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Issue 48, 2019
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The effects of discrete and gradient mid-shell structures on the photoluminescence of single InP quantum dots

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Abstract

We investigated the dependence of the spectral diffusion and blinking behaviors of indium phosphide (InP) based core/shell/shell quantum dots (QDs) on their mid-shell compositions. We synthesized two types of core/shell/shell QDs having different mid-shell structures by controlling the shell thickness, the total sizes, and the selenium to sulfur ratios. The QDs with a discrete mid-shell (DS-QDs) exhibited a higher photoluminescence (PL) quantum yield (QY) and a narrower PL linewidth than the QDs with a gradient mid-shell (GS-QDs). By analyzing X-ray diffraction (XRD) patterns, and Raman spectra, we found that GS-QDs showed a larger lattice mismatch between the core and the shell than DS-QDs. Also, the spectral diffusion, PL blinking, Auger ionization efficiencies, and the lifetime blinking behavior on single QDs revealed that DS-QDs were nearly unaffected by the defect traps.

Graphical abstract: The effects of discrete and gradient mid-shell structures on the photoluminescence of single InP quantum dots

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Supplementary files

Article information


Submitted
09 Aug 2019
Accepted
04 Nov 2019
First published
05 Nov 2019

Nanoscale, 2019,11, 23251-23258
Article type
Paper

The effects of discrete and gradient mid-shell structures on the photoluminescence of single InP quantum dots

S. H. Lee, Y. Kim, H. Jang, J. H. Min, J. Oh, E. Jang and D. Kim, Nanoscale, 2019, 11, 23251
DOI: 10.1039/C9NR06847C

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