Microscopic Origin of the Fast Blue-Green Luminescence from Chemically Synthesized Non-Oxidized Silicon Quantum Dots

K. Dohnalová, T. Gregorkiewicz, A. Fucíková, J. Valenta, C. Umesh, J.M.J. Paulusse, H. Zuilhof, J. Humpolícková, M. van Hof

Research output: Contribution to journalArticleAcademicpeer-review

42 Citations (Scopus)

Abstract

The microscopic origin of the bright nanosecond blue-green photoluminescence (PL), frequently reported for synthesized organically terminated Si quantum dots (Si-QDs), has not been fully resolved, hampering potential applications of this interesting material. Here a comprehensive study of the PL from alkyl-terminated Si-QDs of 2-3 nm size, prepared by wet chemical synthesis is reported. Results obtained on the ensemble and those from the single nano-object level are compared, and they provide conclusive evidence that efficient and tunable emission arises due to radiative recombination of electron-hole pairs confined in the Si-QDs. This understanding paves the way towards applications of chemical synthesis for the development of Si-QDs with tunable sizes and bandgaps.
Original languageEnglish
Pages (from-to)3185-3191
JournalSmall
Volume8
Issue number20
DOIs
Publication statusPublished - 2012

Keywords

  • light-emission
  • confinement regime
  • electronic states
  • si nanocrystals
  • porous silicon
  • photoluminescence
  • nanoparticles
  • alkyl
  • nanoclusters
  • spectroscopy

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