Designer bright and fast CsPbBr<sub>3</sub> perovskite nanocrystal scintillators for high-speed X-ray imaging.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39402070.
- Also identified by DOI 10.1038/s41467-024-53263-9 and PMC identifier 11473900.
- Licence recorded as CC BY-NC-ND.
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Abstract
Bright and fast scintillators are highly crucial for high-speed X-ray imaging in the medical diagnostic radiology including angiography and cardiac computed tomography. The CsPbBr<sub>3</sub> nanocrystal scintillator featuring a nanosecond radioluminescence decay time is a promising candidate. However, it suffers from a substantial photon self-absorption limiting the light output, and being bright and fast simultaneously is difficult. Here we design and in-situ synthesize multi-site ZnS(Ag)-CsPbBr<sub>3</sub> heterostructures to modulate the bright and fast features of scintillators. We find external energy from ZnS(Ag) can effectively transfer to CsPbBr<sub>3</sub> based on the non-radiative Förster resonance energy transfer, resulting in a light yield of 40,000 photons MeV<sup>-1</sup>. By combing a radioluminescence decay time of 36 ns and a spatial resolution of 30 lp mm<sup>-1</sup>, the scintillator enables high-speed X-ray imaging at 200 frames per second. This study showcases the structure design is significant for obtaining bright and fast perovskite scintillators for the real-time X-ray imaging.