Two-fold emission from the S-shell of PbSe/CdSe core/shell quantum dots.

Dominika Grodzińska, Wiel H Evers, Renee Dorland, Jos van Rijssel, Marijn A van Huis, Andries Meijerink, Celso de Mello Donegá, Daniel Vanmaekelbergh

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The optical properties of PbSe/CdSe core/shell quantum dots with core sizes smaller than 4 nm in the 5-300 K range are reported. The photoluminescence spectra show two peaks, which become increasingly separated in energy as the core diameter is reduced below 4 nm. It is shown that these peaks are due to intrinsic exciton transitions in each quantum dot, rather than emission from different quantum dot sub-ensembles. Most likely, the energy separation between the peaks is due to inter-valley coupling between the L-points of PbSe. The temperature dependence of the relative intensities of the peaks implies that the two emitting states are not in thermal equilibrium and that dark exciton states must play an important role. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Original languageEnglish
Pages (from-to)3493-3501
Number of pages9
JournalSmall
Volume7
Issue number24
Publication statusPublished - 21 Oct 2011

Keywords

  • cadmium derivative
  • cadmium selenide
  • lead
  • lead selenide
  • nanoparticle
  • quantum dot
  • selenium derivative
  • absorption
  • article
  • chemistry
  • light related phenomena
  • luminescence
  • spectroscopy
  • temperature
  • transmission electron microscopy
  • ultrastructure

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