Synthesis of monodisperse hexagonal NaYF4:Yb, Ln (Ln = Er, Ho and Tm) upconversion nanocrystals in TOPO

Jingning Shan, Xiao Qin, Nan Yao, Yiguang Ju

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NaYF4 doped with Yb, Ln (Ln = Er, Ho and Tm) upconversion nanocrystals (UP-NCs) were synthesized in trioctylphosphine oxide (TOPO) solvent via a thermolysis method. It was found that the energy barrier of the phase transition from cubic (α) to hexagonal (β) was significantly reduced in TOPO, and the β-phase NCs were obtained in a broad temperature window from 330 to 370°C. The as-synthesized NCs had controllable sizes in the range 5-20 nm with narrow size distribution, and presented highly efficient UP fluorescence.

Original languageEnglish (US)
Article number445607
Issue number44
StatePublished - Nov 7 2007

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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