Molecular Sensitization Enabled High Performance Organic Metal Halide Hybrid Scintillator

Area of Science:

• Materials Science
• Solid-State Physics
• Radiochemistry

Background:

• Scintillators are crucial for medical imaging and security.
• Current scintillators often rely on rare-earth elements and inorganic materials.
• Existing organic scintillators have low X-ray absorption, while inorganic ones suffer from slow decay times.

Purpose of the Study:

• To develop a new organic-inorganic hybrid scintillator using earth-abundant elements.
• To achieve enhanced X-ray scintillation properties via low-temperature synthesis.
• To combine the benefits of organic and inorganic scintillators, addressing their respective limitations.

Main Methods:

• Co-crystallization of an aggregation-induced emission (AIE) organic halide (TPA-PBr) with zinc bromide (ZnBr2) at room temperature.
• Synthesis of a zero-dimensional (0D) organic metal halide hybrid: (TPA-P)2ZnBr4.
• Characterization of photoluminescence and X-ray scintillation properties.

Main Results:

• A novel 0D hybrid scintillator, (TPA-P)2ZnBr4, was successfully synthesized.
• The material exhibits yellowish-green emission peaked at 550 nm.
• Achieved an absolute light yield of 14,700 ± 800 Photons/MeV, exceeding anthracene.
• Demonstrated short photoluminescence (3.56 ns) and radioluminescence (9.96 ns) decay lifetimes.
• The hybrid material shows high X-ray absorption comparable to inorganic scintillators.

Conclusions:

• The developed organic-inorganic hybrid scintillator offers a promising alternative to rare-earth-based materials.
• This material simultaneously addresses the low X-ray absorption of organic scintillators and the long decay lifetimes of inorganic ones.
• The design strategy opens new avenues for creating efficient and fast scintillators for various applications.