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

Sang Hyeon Lee; Yongwook Kim; Hyosook Jang; Ji Hyun Min; Juwon Oh; Eunjoo Jang; Dongho Kim

doi:10.1039/c9nr06847c

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

Sang Hyeon Lee, Yongwook Kim, Hyosook Jang, Ji Hyun Min, Juwon Oh, Eunjoo Jang, Dongho Kim

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

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.

Original language	English
Pages (from-to)	23251-23258
Number of pages	8
Journal	Nanoscale
Volume	11
Issue number	48
DOIs	https://doi.org/10.1039/c9nr06847c
Publication status	Published - 2019 Dec 28

Bibliographical note

Funding Information:
This work at Yonsei University was financially supported by the Samsung Advanced Institute of Technology (SAIT) under Project Number IO170214-04232-01.

Publisher Copyright:
© The Royal Society of Chemistry.

All Science Journal Classification (ASJC) codes

Materials Science(all)

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10.1039/c9nr06847c

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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.",

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note = "Funding Information: This work at Yonsei University was financially supported by the Samsung Advanced Institute of Technology (SAIT) under Project Number IO170214-04232-01. Publisher Copyright: {\textcopyright} The Royal Society of Chemistry.",

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AU - Lee, Sang Hyeon

AU - Kim, Yongwook

AU - Jang, Hyosook

AU - Min, Ji Hyun

AU - Oh, Juwon

AU - Jang, Eunjoo

AU - Kim, Dongho

N1 - Funding Information: This work at Yonsei University was financially supported by the Samsung Advanced Institute of Technology (SAIT) under Project Number IO170214-04232-01. Publisher Copyright: © The Royal Society of Chemistry.

PY - 2019/12/28

Y1 - 2019/12/28

N2 - 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.

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

Abstract

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