Crystallization control toward colorless cerium-doped scintillating glass

Area of Science:

• Materials Science
• Solid State Chemistry
• Optical Materials

Background:

• Cerium-doped materials are crucial for applications like smart lighting and radiation detection.
• A significant challenge in cerium doping is preventing unwanted colorization of the host material.
• Developing colorless, high-performance cerium-doped materials remains an active research area.

Purpose of the Study:

• To present a novel nanocrystallization method for producing colorless cerium-doped glass.
• To achieve extremely high cerium concentrations (15 mol%) without compromising optical clarity.
• To investigate the mechanisms behind colorization and decoloring in cerium-doped glass.

Main Methods:

• Nanocrystallization of cerium-doped glass at high concentrations.
• Structural and optical characterizations (e.g., XRD, spectroscopy).
• Chemical state and local environment investigations (e.g., XPS, EXAFS).

Main Results:

• Successfully synthesized colorless cerium-doped glass with 15 mol% cerium concentration.
• Identified CeF3 precipitation as the cause of colorization during heat treatment.
• Observed a shift from -Ce-O- to -Ce-F- local structures, correlating with decoloring.
• Achieved a ~35-fold enhancement in ultraviolet excited luminescence intensity.
• Demonstrated improved scintillating performance for X-ray detection.

Conclusions:

• The nanocrystallization method effectively prevents colorization in high-concentration cerium-doped glass.
• The local structural change to -Ce-F- units is key to achieving colorless, high-performance materials.
• These findings open new avenues for advanced optical and radiation detection applications.