Anomalous raman scattering of colloidal Yb3+,Er3+ codoped NaYF4 nanophosphors and dynamic probing of the upconversion luminescence

Jingning Shan, Mruthunjaya Uddi, Nan Yao, Yiguang Ju

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87 Scopus citations


Size-dependent Raman spectra of the hexagonal (β)-phase Yb 3+,Er3+ codoped NaYF4 nanophosphors and dynamic probing of the upconversion luminescence (UCL) are reported. Raman scattering results show the normal red shifts of Raman peaks but anomalous line narrowing with decreasing the particle sizes. The phonon confinement effects are believed to be dominated by the surface vibrational energies in affecting UCL. Dynamic decay data are then applied to quantitatively verify the surface effects and size-dependent UCL. Dynamic probing is shown to be an efficient tool to both qualitatively and quantitatively characterize the upconversion nanophorphors (UCNPs) that have no "quantum efficiency." The findings are relevant to the engineering of the nanostructures of the UCNPs for the applications of the bioimaging and photodynamic therapy.

Original languageEnglish (US)
Pages (from-to)3530-3537
Number of pages8
JournalAdvanced Functional Materials
Issue number20
StatePublished - Oct 22 2010

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


  • Raman scattering
  • dynamic decay
  • phonon confinement effects
  • surface effects
  • upconversion nanophosphors


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