Microstructure and environment dependence of H-2(11/2)-> I-4(15/2) upconversion emission in YVO4 : Er3+, Yb3+ nanocrystals

  • Sun Y
  • Chen Y
  • Kong X
 et al. 
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Abstract

Upconversion emission of different nanocrystalline YVO4:Er3+, Yb3+ synthesized by a hydrothermal process at low temperature was studied under 980 nm excitation where green [(H-2(11/2), S-4(3/2))-> I-4(15/2)] and red (F-4(9/2)-> I-4(15/2)) emissions demonstrate sensitivity to the local environments of Er3+. Small particle size, high Yb3+ concentration, or high temperature favors the emission of the H-2(11/2)-> I-4(15/2) transition. Both XRD patterns and Raman spectra have confirmed that crystal lattice distortion of YVO4:Er3+, Yb3+ nanocrystals is more serious when the nanoparticle size is decreasing or Yb3+ concentration is increasing. This distortion is thought to play a key role in the observed spectral properties, which might lead to a new route to improve the monochromatic upconversion emission efficiency in these nanocrystals.

Author-supplied keywords

  • Raman
  • YVO4
  • energy-transfer
  • ions
  • lanthanide
  • luminescence
  • nanocrystals
  • surface
  • upconversion

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Authors

  • Y J Sun

  • Y Chen

  • X G Kong

  • K F Chao

  • Y Yu

  • Q H Zeng

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