Solid-state synthesis of polycrystalline CsPbCl ₃ :Yb quantum-cutting scintillators for x-ray imaging

Abstract X-ray imaging has found applications in many aspects of modern society. Highly sensitive imaging detectors with simple manufacturing methods can increase the deployment of detectors and enable low-dose imaging. In this work, we report on the impact of the solid-state synthesis conditions on the scintillator properties of the lead halide perovskite CsPbCl ₃ :Yb. We optimize the synthesis conditions to maximize the light output when exposed to a radiography-relevant spectrum of x-rays. Using optimized conditions, we produced a scintillator powder with light output above 40,000 photons MeV ⁻¹ , rivaling commercially available radiography scintillators. The imaging characteristics are measured for scintillator screens comprised of powder dispersed in a polymer matrix and find the spatial resolution acceptable for general radiography. We conclude that CsPbCl ₃ :Yb produced in this manner can be used for low frame rate radiography in conjunction with silicon photodetectors and has potential for much higher quantum efficiency imaging if used in conjunction with an NIR optimized photosensor.