Optical and electronic properties of type-II CdSe/CdS core-shell quantum dots

Dea Uk Lee; Dong Yeol Yun; Tae Whan Kim; Seoung Hwan Park; Donghyeuk Choi; Sang Wook Kim; Keon Ho Yoo; Hong Seok Lee; Young Hae Kwon; Tae Won Kang

doi:10.7567/APEX.8.061201

Optical and electronic properties of type-II CdSe/CdS core-shell quantum dots

Dea Uk Lee
, Dong Yeol Yun
, Tae Whan Kim^*
, Seoung Hwan Park
, Donghyeuk Choi
, Sang Wook Kim
, Keon Ho Yoo
, Hong Seok Lee
, Young Hae Kwon
, Tae Won Kang

^*Corresponding author for this work

Department of Physics

Hanyang University
Catholic University of Daegu
Ajou University
Kyung Hee University
Dongguk University

Research output: Contribution to journal › Journal article › peer-review

4 Scopus citations

Abstract

CdSe/CdS core-shell quantum dots (QDs) were synthesized using a facile method in aqueous phase. X-ray diffraction pattern, high-resolution transmission electron microscopy images, and energy dispersive spectroscopy profiles showed that stoichiometric CdSe/CdS QDs were formed. Temperature-dependent photoluminescence spectra showed that the activation energy of CdSe/CdS core-shell QDs was 15meV. The potential profiles and interband transition energies of the strained type-II CdSe/CdS core-shell QDs were calculated. The calculated interband transition energies slightly decreased from 2.061 to 2.007 eV when the shell thickness increased from 10 to 17 Å. The theoretical interband transition energy of 2.007 eV was in reasonable agreement with the photoluminescence excitonic transition energy of 1.98 eV.

Original language	English
Article number	061201
Journal	Applied Physics Express
Volume	8
Issue number	6
DOIs	https://doi.org/10.7567/APEX.8.061201
State	Published - 2015.06.1

Quacquarelli Symonds(QS) Subject Topics

Physics & Astronomy

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10.7567/APEX.8.061201

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@article{0088f8bef04e495d9d06ae91cfdab7d0,

title = "Optical and electronic properties of type-II CdSe/CdS core-shell quantum dots",

abstract = "CdSe/CdS core-shell quantum dots (QDs) were synthesized using a facile method in aqueous phase. X-ray diffraction pattern, high-resolution transmission electron microscopy images, and energy dispersive spectroscopy profiles showed that stoichiometric CdSe/CdS QDs were formed. Temperature-dependent photoluminescence spectra showed that the activation energy of CdSe/CdS core-shell QDs was 15meV. The potential profiles and interband transition energies of the strained type-II CdSe/CdS core-shell QDs were calculated. The calculated interband transition energies slightly decreased from 2.061 to 2.007 eV when the shell thickness increased from 10 to 17 {\AA}. The theoretical interband transition energy of 2.007 eV was in reasonable agreement with the photoluminescence excitonic transition energy of 1.98 eV.",

author = "Lee, \{Dea Uk\} and Yun, \{Dong Yeol\} and Kim, \{Tae Whan\} and Park, \{Seoung Hwan\} and Donghyeuk Choi and Kim, \{Sang Wook\} and Yoo, \{Keon Ho\} and Lee, \{Hong Seok\} and Kwon, \{Young Hae\} and Kang, \{Tae Won\}",

note = "Publisher Copyright: {\textcopyright} 2015 The Japan Society of Applied Physics.",

year = "2015",

month = jun,

day = "1",

doi = "10.7567/APEX.8.061201",

language = "English",

volume = "8",

journal = "Applied Physics Express",

issn = "1882-0778",

number = "6",

}

TY - JOUR

T1 - Optical and electronic properties of type-II CdSe/CdS core-shell quantum dots

AU - Lee, Dea Uk

AU - Yun, Dong Yeol

AU - Kim, Tae Whan

AU - Park, Seoung Hwan

AU - Choi, Donghyeuk

AU - Kim, Sang Wook

AU - Yoo, Keon Ho

AU - Lee, Hong Seok

AU - Kwon, Young Hae

AU - Kang, Tae Won

PY - 2015/6/1

Y1 - 2015/6/1

N2 - CdSe/CdS core-shell quantum dots (QDs) were synthesized using a facile method in aqueous phase. X-ray diffraction pattern, high-resolution transmission electron microscopy images, and energy dispersive spectroscopy profiles showed that stoichiometric CdSe/CdS QDs were formed. Temperature-dependent photoluminescence spectra showed that the activation energy of CdSe/CdS core-shell QDs was 15meV. The potential profiles and interband transition energies of the strained type-II CdSe/CdS core-shell QDs were calculated. The calculated interband transition energies slightly decreased from 2.061 to 2.007 eV when the shell thickness increased from 10 to 17 Å. The theoretical interband transition energy of 2.007 eV was in reasonable agreement with the photoluminescence excitonic transition energy of 1.98 eV.

AB - CdSe/CdS core-shell quantum dots (QDs) were synthesized using a facile method in aqueous phase. X-ray diffraction pattern, high-resolution transmission electron microscopy images, and energy dispersive spectroscopy profiles showed that stoichiometric CdSe/CdS QDs were formed. Temperature-dependent photoluminescence spectra showed that the activation energy of CdSe/CdS core-shell QDs was 15meV. The potential profiles and interband transition energies of the strained type-II CdSe/CdS core-shell QDs were calculated. The calculated interband transition energies slightly decreased from 2.061 to 2.007 eV when the shell thickness increased from 10 to 17 Å. The theoretical interband transition energy of 2.007 eV was in reasonable agreement with the photoluminescence excitonic transition energy of 1.98 eV.

UR - https://www.scopus.com/pages/publications/84930705102

U2 - 10.7567/APEX.8.061201

DO - 10.7567/APEX.8.061201

M3 - Journal article

AN - SCOPUS:84930705102

SN - 1882-0778

VL - 8

JO - Applied Physics Express

JF - Applied Physics Express

IS - 6

M1 - 061201

ER -

Optical and electronic properties of type-II CdSe/CdS core-shell quantum dots

Abstract

Quacquarelli Symonds(QS) Subject Topics

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