First-principles study of lithium aluminosilicate glass scintillators

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.