Highly Efficient Inorganic 2D Bismuth-Doped Lanthanide Metal Halide Scintillators Enable High-Resolution X-Ray...

Area of Science:

• Materials Science
• Inorganic Chemistry
• Optoelectronics

Background:

• Inorganic metal halides are promising for optoelectronics but suffer from hydrolytic degradation.
• Developing stable and high-performance materials is crucial for practical applications.

Purpose of the Study:

• To report a novel 2D lanthanide halide structure, Cs2TbCl5·6H2O, with enhanced stability and optoelectronic properties.
• To investigate its potential for high-resolution X-ray imaging.

Main Methods:

• Synthesis of a novel 2D lanthanide halide, Cs2TbCl5·6H2O.
• Structural analysis and characterization of optical properties.
• Bi3+ doping and investigation of energy transfer mechanisms.
• Fabrication of scintillator films for X-ray imaging.

Main Results:

• Cs2TbCl5·6H2O exhibits narrow-band green emission and remarkable recoverability via water-mediated recrystallization.
• Achieved a high photoluminescence quantum yield (82.92%) and X-ray light yield (58,000 ± 2000 photons/MeV).
• Scintillator films demonstrated high spatial resolution (19.69 lp mm-1).

Conclusions:

• A new synthetic strategy for stable 2D lanthanide halides was developed.
• Cs2TbCl5·6H2O shows exceptional stability and optical properties, overcoming hydrolytic degradation.
• The material is promising for advanced applications like high-resolution X-ray imaging.