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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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Publication details

The article was received on 09 Aug 2019, accepted on 04 Nov 2019 and first published on 05 Nov 2019


Article type: Paper
DOI: 10.1039/C9NR06847C
Nanoscale, 2019, Advance Article

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    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, Advance Article , DOI: 10.1039/C9NR06847C

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