Mid-Infrared Photoluminescence of CdS and CdSe Colloidal Quantum Dots

Kwang Seob Jeong, Philippe Guyot-Sionnest

Research output: Contribution to journalArticle

33 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

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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