Mid-Infrared Photoluminescence of CdS and CdSe Colloidal Quantum Dots

Kwang Seob Jeong; Philippe Guyot-Sionnest

doi:10.1021/acsnano.5b06882

Mid-Infrared Photoluminescence of CdS and CdSe Colloidal Quantum Dots

Kwang Seob Jeong, Philippe Guyot-Sionnest

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

45 Citations (Scopus)

Abstract

Mid-infrared intraband photoluminescence is observed from CdSe and CdS colloidal quantum dots (CQDs) and core/shell systems when excited by a visible laser. The CQDs show more intraband photoluminescence with dodecanethiol than with other ligands. Core/shells show an increase of the intraband photoluminescence with increasing shell thickness. The detected emission is restricted to below 2900 cm^-1, bounded by the C-H vibrational modes of the organic ligands. Upon photoexcitation in air for all dodecanethiol ligands capped CQD systems studied, the intraband photoluminescence is quenched over time, and emission at lower frequency is observed, which is assigned to laser heating and thermal emission from oxides.

Original language	English
Pages (from-to)	2225-2231
Number of pages	7
Journal	ACS nano
Volume	10
Issue number	2
DOIs	https://doi.org/10.1021/acsnano.5b06882
Publication status	Published - 2016 Feb 23
Externally published	Yes

Keywords

CdS/ZnSe
CdSe
CdSe/ZnS
CdSe/ZnSe
CdSe/ZnTe
II-VI colloidal quantum dot
intraband photoluminescence

ASJC Scopus subject areas

Materials Science(all)
Engineering(all)
Physics and Astronomy(all)

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10.1021/acsnano.5b06882

Cite this

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title = "Mid-Infrared Photoluminescence of CdS and CdSe Colloidal Quantum Dots",

abstract = "Mid-infrared intraband photoluminescence is observed from CdSe and CdS colloidal quantum dots (CQDs) and core/shell systems when excited by a visible laser. The CQDs show more intraband photoluminescence with dodecanethiol than with other ligands. Core/shells show an increase of the intraband photoluminescence with increasing shell thickness. The detected emission is restricted to below 2900 cm-1, bounded by the C-H vibrational modes of the organic ligands. Upon photoexcitation in air for all dodecanethiol ligands capped CQD systems studied, the intraband photoluminescence is quenched over time, and emission at lower frequency is observed, which is assigned to laser heating and thermal emission from oxides.",

keywords = "CdS/ZnSe, CdSe, CdSe/ZnS, CdSe/ZnSe, CdSe/ZnTe, II-VI colloidal quantum dot, intraband photoluminescence",

author = "Jeong, {Kwang Seob} and Philippe Guyot-Sionnest",

note = "Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",

year = "2016",

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doi = "10.1021/acsnano.5b06882",

language = "English",

volume = "10",

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journal = "ACS nano",

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T1 - Mid-Infrared Photoluminescence of CdS and CdSe Colloidal Quantum Dots

AU - Jeong, Kwang Seob

AU - Guyot-Sionnest, Philippe

PY - 2016/2/23

Y1 - 2016/2/23

N2 - Mid-infrared intraband photoluminescence is observed from CdSe and CdS colloidal quantum dots (CQDs) and core/shell systems when excited by a visible laser. The CQDs show more intraband photoluminescence with dodecanethiol than with other ligands. Core/shells show an increase of the intraband photoluminescence with increasing shell thickness. The detected emission is restricted to below 2900 cm-1, bounded by the C-H vibrational modes of the organic ligands. Upon photoexcitation in air for all dodecanethiol ligands capped CQD systems studied, the intraband photoluminescence is quenched over time, and emission at lower frequency is observed, which is assigned to laser heating and thermal emission from oxides.

AB - Mid-infrared intraband photoluminescence is observed from CdSe and CdS colloidal quantum dots (CQDs) and core/shell systems when excited by a visible laser. The CQDs show more intraband photoluminescence with dodecanethiol than with other ligands. Core/shells show an increase of the intraband photoluminescence with increasing shell thickness. The detected emission is restricted to below 2900 cm-1, bounded by the C-H vibrational modes of the organic ligands. Upon photoexcitation in air for all dodecanethiol ligands capped CQD systems studied, the intraband photoluminescence is quenched over time, and emission at lower frequency is observed, which is assigned to laser heating and thermal emission from oxides.

KW - CdS/ZnSe

KW - CdSe

KW - CdSe/ZnS

KW - CdSe/ZnSe

KW - CdSe/ZnTe

KW - II-VI colloidal quantum dot

KW - intraband photoluminescence

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U2 - 10.1021/acsnano.5b06882

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JO - ACS nano

JF - ACS nano

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Mid-Infrared Photoluminescence of CdS and CdSe Colloidal Quantum Dots

Abstract

Keywords

ASJC Scopus subject areas

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