Highly luminescent ZnO quantum dots made in a nonthermal plasma

Patrick Felbier, Jihua Yang, Jens Theis, Richard William Liptak, Andrew Wagner, Axel Lorke, Gerd Bacher, Uwe Kortshagen

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

Nonthermal plasmas allow the preparation of ligand-free quantum dots combining high production rates with superior crystalline quality and luminescence properties. Here, ZnO quantum dots are produced in a radiofrequency capacitively-coupled plasma, exhibiting size dependent photoluminescent quantum yields up to 60% after air exposure - the highest reported to date for any compound semiconductor quantum dots prepared in the gas phase. Systematic studies indicate the importance of the surface for the observed luminescence behavior. The high luminescent quantum yields in the visible range of the spectrum and the ligand-free, scalable synthesis make these quantum dots good candidates for light emitting applications.

Original languageEnglish (US)
Pages (from-to)1988-1993
Number of pages6
JournalAdvanced Functional Materials
Volume24
Issue number14
DOIs
StatePublished - Apr 9 2014

Keywords

  • luminescence
  • nanoparticles
  • quantum dots
  • zinc oxide

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