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Related Experiment Videos

Uniform Y2O3 coating on multi-component phosphor powders by modified polyol process.

Donjo Kim1, Sunho Jeong, Jooho Moon

  • 1School of Advanced Materials Engineering, Yonsei University, Seoul 120-749, Korea.

Journal of Colloid and Interface Science
|November 29, 2005
PubMed
Summary

A novel coating method using Y2O3 protects phosphors from degradation. This technique enhances phosphor stability against mercury and oxidation, improving their longevity and performance in applications.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Nanotechnology

Background:

  • Phosphors in multi-component systems are susceptible to aging effects, reducing their performance over time.
  • Degradation mechanisms include mercury adsorption and oxidation, particularly impacting UV-activated phosphors.
  • Developing protective coatings is crucial for enhancing phosphor durability and operational lifespan.

Purpose of the Study:

  • To develop an effective method for coating phosphors to prevent aging.
  • To utilize Yttrium Oxide (Y2O3) as a protective coating material due to its beneficial properties.
  • To ensure the coating process does not negatively affect phosphor characteristics.

Main Methods:

  • Coating phosphor particles by dispersing them in a polyol medium containing an yttrium precursor.

Related Experiment Videos

  • Inducing heterogeneous nucleation and growth of amorphous Y2O3 sols on the phosphor surface.
  • Controlled heat treatment to crystallize Y2O3, remove organic impurities, and prevent phosphor oxidation.
  • Characterization using X-ray Diffraction (XRD), Thermogravimetric Differential Thermal Analysis (TG/DTA), and Scanning Electron Microscopy (SEM).

    • Main Results:

    • Achieved a thick and uniform coating of amorphous Y2O3 on phosphor particles.
    • Optimized heat treatment conditions to ensure complete Y2O3 crystallization and organic impurity burnout.
    • Verified Y2O3's resistance to mercury adsorption and oxidation, and its UV transparency.
    • SEM analysis confirmed the surface morphology of the coated phosphors.

    Conclusions:

    • The developed Y2O3 coating method effectively prevents phosphor aging.
    • Y2O3 is a suitable protective material for phosphors, enhancing stability and performance.
    • The process offers a viable strategy for improving the longevity of phosphors in various applications.