Mid-Infrared Photoluminescence of CdS and CdSe Colloidal Quantum Dots

Kwang Seob Jeong, Philippe Guyot-Sionnest

Research output: Contribution to journalArticle

32 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 languageEnglish
Pages (from-to)2225-2231
Number of pages7
JournalACS Nano
Volume10
Issue number2
DOIs
Publication statusPublished - 2016 Feb 23
Externally publishedYes

Fingerprint

Semiconductor quantum dots
Photoluminescence
quantum dots
Infrared radiation
photoluminescence
Ligands
ligands
Laser heating
Photoexcitation
laser heating
thermal emission
photoexcitation
Oxides
vibration mode
low frequencies
oxides
Lasers
air
Air
lasers

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)

Cite this

Mid-Infrared Photoluminescence of CdS and CdSe Colloidal Quantum Dots. / Jeong, Kwang Seob; Guyot-Sionnest, Philippe.

In: ACS Nano, Vol. 10, No. 2, 23.02.2016, p. 2225-2231.

Research output: Contribution to journalArticle

Jeong, Kwang Seob ; Guyot-Sionnest, Philippe. / Mid-Infrared Photoluminescence of CdS and CdSe Colloidal Quantum Dots. In: ACS Nano. 2016 ; Vol. 10, No. 2. pp. 2225-2231.
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