Bright green upconversion fluorescence of Yb 3+, Er 3+-Codoped NaYF 4 nanocrystals

Lili Wang, Weiping Qin, Yan Wang, Guofeng Wang, Chunyan Cao, Guodong Wei, Ryongjin Kim, Daisheng Zhang, Fuheng Ding, Chunfeng He

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13 Scopus citations


Uniform hexagonal NaYF 4: Yb 3+, Er 3+ nanocrystals (NCs) with bright green upconversion fluorescence were prepared. The nanocrystals were highly hydrophobic and dispersed in cyclohexane forming a transparent colloidal solution due to the use of oleic acid as a capping ligand. Temperature dependence for emission of Er 3+ ions in this sample was also studied. The green emission intensity of Er 3+ ions had a maximum at 160 K under 980 nm excitation, which was attributed to the thermally activated distribution of electrons and the thermal quenching effect. The transparent colloidal solution is expected to be a good candidate for research in biological imaging or display applications.

Original languageEnglish
Pages (from-to)1825-1828
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Issue number3
StatePublished - Mar 2010
Externally publishedYes


  • NaYF
  • Nonradiative relaxation
  • Rare earth


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