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Solar-blind ultraviolet-C persistent luminescence phosphors.

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Researchers developed new ultraviolet-C persistent phosphors using Pr3+-doped silicates. These phosphors glow in bright light, expanding persistent luminescence applications beyond darkness.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Luminescence

Background:

  • Visible and infrared persistent phosphors are widely used for glowing tags in dark environments.
  • A gap exists in persistent phosphors for higher-energy, solar-blind ultraviolet-C (UV-C) wavelengths (200-280 nm).
  • Existing persistent tags are not effective in bright ambient light conditions.

Purpose of the Study:

  • To develop novel UV-C persistent phosphors capable of functioning in bright environments.
  • To investigate Pr3+-doped silicates for their potential as UV-C persistent materials.
  • To expand the application scope of persistent luminescence technology.

Main Methods:

  • Synthesis and characterization of five types of Pr3+-doped silicate phosphors (melilite, cyclosilicate, silicate garnet, oxyorthosilicate, orthosilicate).
  • Charging the phosphors using a standard 254 nm UV lamp.
  • Monitoring and imaging the persistent afterglow emission at 265-270 nm using a corona camera under various lighting conditions (daylight, room light).
  • Investigating the roles of thermal and photo-stimulation on afterglow emission.

Main Results:

  • Successfully developed five types of Pr3+-doped silicate UV-C persistent phosphors.
  • These phosphors exhibit intense and long-lasting afterglow at 265-270 nm after excitation with 254 nm light.
  • The afterglow is observable and imageable by a corona camera even in bright daylight and room light.
  • Photo-stimulation significantly contributes to, and can dominate, the afterglow emission in bright environments.

Conclusions:

  • This study introduces novel UV-C persistent phosphors based on Pr3+-doped silicates.
  • These materials enable self-sustained glowing tags that operate effectively in bright ambient light.
  • The findings broaden the research frontier of persistent luminescence into the UV-C spectrum and unlock new application possibilities.