A solvothermal route to size-and phase-controlled highly luminescent NaYF 4:Yb,Er Up-conversion nanocrystals

Qiang Wang, Mei Chee Tan, Rui Zhuo, G. A. Kumar, Richard E. Riman

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


Size-controlled hexagonal- and cubic-phase NaYF 4:Yb, Er nanocrystals with bright fluorescent emission were successfully synthesized via a solvothermal approach at a relatively low temperature (<300 °C). A mixture of ethanol and ethylene glycol or pure ethylene glycol was used as a solvent, whereby changing the ethanol concentration. It is found that, besides reaction temperature and time, the reactant concentration is an important factor to control crystal phase. High reactant concentration, high reaction temperature, high concentration of ethanol and long reaction durations are favorable to the formation of brightly emitting hexagonal-phase nanocrystals. The effects of these reaction conditions on the size and the luminescent properties of the as-prepared nanocrystals are discussed. It is found that 30-120 nm hexagonal NaYF 4:Yb,Er nanoparticles can be prepared using 0.04 M reactant concentration in 0-60% ethanol solution at 220 °C for 24 h.

Original languageEnglish (US)
Pages (from-to)1685-1692
Number of pages8
JournalJournal of Nanoscience and Nanotechnology
Issue number3
StatePublished - Mar 2010

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics


  • Crystal structure
  • Luminescence
  • Nanomaterials
  • Solvothermal crystal growth
  • Up-Conversion


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