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First-principles study of lithium aluminosilicate glass scintillators.

E M Ghardi1, A Scrimshire2, R Smith2

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Optimizing cerium-doped lithium aluminosilicate glass scintillators involves tuning the Al/M ratio. Higher ratios increase polymerization and improve cerium incorporation, enhancing photon yield for better neutron detection.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nuclear Instrumentation

Background:

  • Glass scintillators are vital radiation sensors used across diverse fields like medicine and security.
  • Current glass scintillators offer versatility but have limitations in self-absorption, refractive index, and radiative efficiency.
  • Developing advanced glass scintillators with enhanced properties is an ongoing research objective.

Purpose of the Study:

  • To investigate atomic-scale factors limiting glass scintillator performance.
  • To explore the impact of composition on structural and electronic properties of cerium-doped lithium aluminosilicate glasses.
  • To guide the optimization of glass scintillators for improved radiation detection.

Main Methods:

  • Utilized atomic scale simulations, including molecular dynamics and density functional theory.
  • Studied three distinct glass compositions with varying Al/M ratios (0.1, 0.8, 1.2).
  • Analyzed structural parameters, electronic density of states, and Bader charge distribution.

Main Results:

  • Increased polymerization and more effective Ce3+ incorporation were observed for Al/M ratios > 1.
  • The Al-O bond order is sensitive to lithium-rich environments.
  • Higher Al/M ratios correlated with reduced localized trapping states, suggesting increased radiative recombination probability.
  • Photon yield is expected to increase with higher Al/M ratios.

Conclusions:

  • Compositional tuning, specifically the Al/M ratio, significantly influences glass scintillator properties.
  • Optimized Li-glasses show potential for enhanced performance in neutron detection systems.
  • Atomic-scale simulations provide crucial insights for designing next-generation glass scintillators.