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Optically Stimulated Ultraviolet-C Luminescence for Solar Blind Imaging.

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Summary
This summary is machine-generated.

This study introduces a novel double perovskite phosphor, Cs2NaYF6:Pr3+, that emits ultraviolet-C (UVC) optically stimulated luminescence (OSL). This breakthrough overcomes ambient light interference, enabling new applications in radiation detection and anti-counterfeiting.

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Pr3+Solar blind imagingUltraviolet‐Cdouble perovskitesoptically stimulated luminescence

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Luminescence

Background:

  • Optically stimulated luminescence (OSL) materials convert trapped charges to light, useful for radiation detection and anti-counterfeiting.
  • Existing OSL materials emit in visible/near-infrared, limiting applications due to ambient light overlap.
  • Development of OSL materials emitting in the ultraviolet-C (UVC) range is needed.

Purpose of the Study:

  • To report a novel double perovskite phosphor, Cs2NaYF6:Pr3+, exhibiting ultraviolet-C (UVC) optically stimulated luminescence (OSL).
  • To investigate the mechanism of UVC OSL generation and its dependence on stimulation wavelength.
  • To demonstrate the potential application of this UVC OSL material in tracking and marking.

Main Methods:

  • Synthesis and characterization of Cs2NaYF6:Pr3+ double perovskite phosphor.
  • X-ray irradiation to induce charge carrier trapping.
  • Wavelength-dependent optically stimulated luminescence measurements to analyze UVC emission.
  • Investigation of trap-clearing capability and luminescence persistence under light/heat stimulation.

Main Results:

  • Cs2NaYF6:Pr3+ exhibits strong and persistent UVC OSL emission upon X-ray irradiation.
  • The UVC OSL signal is generated by trapped charge carriers stimulated by light over a broad wavelength range.
  • The study elucidates the influence of excitation wavelength on UVC OSL intensity and characteristics.
  • Demonstrated potential for tracking and marking applications in bright environments, like sunlight.

Conclusions:

  • Cs2NaYF6:Pr3+ is a promising material for UVC OSL applications, overcoming limitations of visible/NIR OSL.
  • Understanding the wavelength dependence of UVC OSL is crucial for material design and application development.
  • This work provides a foundation for exploring new UVC OSL materials and expanding their technological utility.