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Related Experiment Videos

Core-shell structured SiO2@YVO4:Dy3+/Sm3+ phosphor particles: sol-gel preparation and characterization.

H Wang1, M Yu, C K Lin

  • 1Key laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China.

Journal of Colloid and Interface Science
|April 25, 2006
PubMed
Summary
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Researchers developed novel SiO(2)@YVO(4):Dy(3+)/Sm(3+) core-shell phosphors using a sol-gel process. These materials exhibit strong photoluminescence, with intensity tunable by annealing and coating cycles.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Chemistry

Background:

  • Core-shell nanostructures offer unique optical and electronic properties.
  • Rare-earth-doped phosphors are crucial for lighting and display technologies.

Purpose of the Study:

  • To synthesize and characterize SiO(2)@YVO(4):Dy(3+)/Sm(3+) core-shell phosphors.
  • To investigate the effect of annealing temperature and coating cycles on photoluminescence.

Main Methods:

  • Pechini sol-gel process for core-shell synthesis.
  • Characterization using XRD, FE-SEM, TEM, and PL spectroscopy.
  • Photoluminescence lifetime measurements.

Main Results:

  • Successfully synthesized spherical SiO(2)@YVO(4):Dy(3+)/Sm(3+) core-shell particles (approx. 300 nm).

Related Experiment Videos

  • Achieved controllable shell thickness (20 nm/cycle) and non-agglomerated structures.
  • Observed strong Dy(3+) and Sm(3+) emissions due to efficient host-to-dopant energy transfer.
  • Demonstrated increased photoluminescence intensity with higher annealing temperatures and more coating cycles.

    • Conclusions:

    • The Pechini sol-gel method is effective for creating uniform SiO(2)@YVO(4):Dy(3+)/Sm(3+) core-shell phosphors.
    • Photoluminescence properties are tunable, indicating potential for optoelectronic applications.
    • Efficient energy transfer from YVO(4) host to Dy(3+) and Sm(3+) dopants enhances luminescence.