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Sub-Nanosecond 2D Perovskite Scintillators by Dielectric Engineering
Mengling Xia1, Zuoxiang Xie1, Hanqi Wang1
1Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Optical Valley Laboratory, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|February 10, 2023
Summary
Researchers developed a new 2D organic-inorganic hybrid perovskite (OIHP) material, BM2PbBr4, achieving a record-fast 0.97 ns decay time for ultrafast scintillators. This breakthrough offers superior performance for advanced radiation detection applications.
Area of Science:
- Materials Science
- Solid-State Physics
- Nuclear Instrumentation
Background:
- Perovskite materials show promise for ultrafast scintillators with high light yield.
- Current perovskite scintillators lack sub-nanosecond decay times, hindering applications in high-speed X-ray imaging and time-of-flight tomography.
- Sub-nanosecond scintillators are crucial for precise radiation detection and timing resolution.
Purpose of the Study:
- To develop a perovskite scintillator with a decay time in the sub-nanosecond region.
- To enhance the dielectric contrast within 2D organic-inorganic hybrid perovskites (OIHP) for faster scintillation.
- To achieve a combination of ultrafast decay time and high light yield for improved radiation detection.
Main Methods:
- Rational design strategy by maximizing dielectric difference between organic amines and Pb-Br emitters in 2D OIHP.
- Insertion of benzimidazole (BM) with a low dielectric constant between [PbBr6]2- layers.
- Characterization of the resulting 2D OIHP, BM2PbBr4, for its photophysical properties and performance in radiation detection.
Main Results:
- Achieved a record-low emitting decay time of 0.97 ns in BM2PbBr4, the fastest among perovskite materials.
- Observed a high light yield of 3190 photons MeV-1, exceeding the conventional BaF2 scintillator.
- Demonstrated excellent performance in gamma-ray, neutron, and alpha-particle detection.
- Attained a theoretical coincidence time resolution of 65.1 ps, significantly outperforming LYSO (141.3 ps).
Conclusions:
- The designed BM2PbBr4 exhibits an unprecedented combination of ultrafast decay time and high light yield.
- This novel perovskite material offers superior performance for demanding radiation detection applications requiring high speed and precision.
- The strategy of maximizing dielectric contrast is effective for developing next-generation ultrafast scintillators.
