Visualization of X-rays with an Ultralow Detection Limit via Zero-Dimensional Perovskite Scintillators.

X-rays play an extremely significant role in medical diagnosis, safety testing, scientific research, and other practical applications. However, as the main sources of radioactive pollution, the hazard of X-rays to human health and the environment has been a major concern. Herein, the explored perovskite scintillator of Cs 2 Zr 1 -x Pb x Cl 6 in this work exhibits an ultrahigh radioluminescence intensity owing to the enhanced X-ray absorption for the introduction of Pb 2+ ions. The Cs 2 Zr 1 -x Pb x Cl 6 crystals are demonstrated as efficient scintillators with a self-trapped exciton emission and extremely high steady-state light yield (∼101,944 photons meV -1 ). This fascinating scintillator provides a convenient visual tool for X-ray detection even for an indoor lighting environment, reaching a low detection limit of ∼14.2 nGy·s -1 , which is about 1/387 of the typical medical imaging dose (5.5 μGy·s -1 ). Moreover, X-ray imaging with a high resolution of 16.6 lp·mm -1 is achieved with the as-explored Cs 2 Zr 1 -x Pb x Cl 6 scintillator film. Herein, the Cs 2 Zr 1 -x Pb x Cl 6 scintillator provides a feasible strategy for X-ray monitoring in the field of biomedicine, high-energy physics, national security, and other applications.