X-ray Scintillation in Lead Halide Perovskite Crystals.

Area of Science:

• Materials Science
• Physics
• Crystallography

Background:

• Current X-ray detection methods use expensive inorganic crystals, limiting large-area applications.
• Hybrid lead halide perovskites offer efficient X-ray absorption and detection due to heavy atoms.

Purpose of the Study:

• To compare the X-ray scintillator properties of 3D (MAPbI3, MAPbBr3) and 2D ((EDBE)PbCl4) hybrid perovskite single crystals.
• To evaluate the potential of these perovskites for advanced scintillator applications.

Main Methods:

• X-ray excited thermoluminescence measurements.
• Characterization of X-ray scintillator properties including luminescence yield and trap states.
• Comparison of 3D and 2D perovskite crystal performance at different temperatures.

Main Results:

• Perovskite single crystals showed minimal deep traps and shallow trap states, reducing after-glow.
• High X-ray excited luminescence yields (>120,000 photons/MeV) were observed at low temperatures.
• 2D (EDBE)PbCl4 demonstrated reduced thermal quenching and a moderate room-temperature light yield (9,000 photons/MeV).

Conclusions:

• 2D metal halide perovskites exhibit significant potential for developing large-area, cost-effective scintillator devices.
• These materials are suitable for medical, security, and scientific X-ray detection applications.
• The reduced thermal effects in 2D perovskites enhance their viability for room-temperature operation.