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Keywords:

  • up-conversion nanocrystals;
  • NaYF4:Yb;
  • NaYF4:Er;
  • transition metals;
  • dopants
Thumbnail image of graphical abstract

The hot-injection synthesis of manganese ion (Mn2+)-doped NaYF4:Yb,Er nanocrystals (NCs) with red up-converting emission and the diameter tunable from 8 to 15 nm is demonstrated. The Mn2+ dosage, growth temperature, and heating rate determine the doping modes, including surface doping and interior doping. Surface doping produces small NCs and interior doping contributes to the red emission.