Optical Properties of PbS/CdS Core/Shell Quantum Dots

Yolanda Justo*, Pieter Geiregat, Karen Van Hoecke, Frank Vanhaecke, Celso De Mello Donega, Zeger Hens

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We determine the optical properties of PbS/CdS core/shell QDs, addressing the energy and the oscillator strength of the first exciton transition and the intrinsic absorption coefficient at short wavelengths. It follows that the intrinsic absorption coefficient at wavelengths of 350 and 400 nm agrees with theoretical numbers predicted using the Maxwell-Garnett model. Moreover, close correspondence is demonstrated between the energy and the oscillator strength of the first exciton transition of PbS/CdS core/shell and PbS QDs with a similar core size. This provides a straightforward, way to estimate the PbS core diameter in PbS/CdS core/shell quantum dots by means of the PbS sizing curve, and it indicates that PbS/CdS QDs exhibit a type 1 band alignment.

Original languageEnglish
Pages (from-to)20171-20177
Number of pages7
JournalJournal of Physical Chemistry C
Volume117
Issue number39
DOIs
Publication statusPublished - 3 Oct 2013

Funding

This research has been funded by the FWO-Vlaanderen (project NanoMIR), BelSPo (IAP 7.35, photonics@be), and EU-FP7 (ITN Herodot, Grant Agreement 214954, STREP Navolchi).

Keywords

  • LIGHT-EMITTING-DIODES
  • SEMICONDUCTOR NANOCRYSTALS
  • PBSE/CDSE CORE/SHELL
  • CATION-EXCHANGE
  • EMISSION
  • SHELL
  • PHOTOLUMINESCENCE
  • CDSE
  • PBSE
  • HETEROSTRUCTURES

Fingerprint

Dive into the research topics of 'Optical Properties of PbS/CdS Core/Shell Quantum Dots'. Together they form a unique fingerprint.

Cite this