Jump to main content
Jump to site search


The Effects of Discrete and Gradient Mid-Shell Structures on Photoluminescence of Single InP Quantum Dots

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 with controlling the shell thickness, the total sizes, and the selenium to sulfur ratios. The QDs with a discrete mid-shell (DS-QDs) exhibited 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 core and shell than DS-QDs did. 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.

Back to tab navigation

Supplementary files

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, Accepted Manuscript

  •   Request permissions

    The Effects of Discrete and Gradient Mid-Shell Structures on 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, Accepted Manuscript , DOI: 10.1039/C9NR06847C

Search articles by author

Spotlight

Advertisements