Tb3+-doped a zero-dimensional all-inorganic metal halide perovskite scintillator Cs2ScCl5·H2O for X-ray imaging

Abstract

All-inorganic zero-dimensional (0D) metal halide perovskite materials have been widely studied in solid-state lighting due to their unique optical properties. However, there are few researchs on their potential applications in X-ray imaging. Herein, we synthesized an all-inorganic 0D metal halide perovskite scintillator, Cs₂ScCl₅·H₂O:Tb³⁺, was prepared by using a hydrothermal method. Upon 240 nm excitation, the emission spectrum of Cs₂ScCl₅·H₂O:Tb³⁺ is primarily composed of characteristic emissions from Tb³⁺, with the strongest emission peak at 548 nm. Additionally, under X-ray excitation, it exhibits blue light showing an intense emission band centered at 425 nm due to self-trapped (STE) emission, and a rather weaker green emission caused by energy transfer from STE emission to Tb³⁺ ions. Based on this, a flexible film prepared by using the as-obtained scintillator Cs₂ScCl₅·H₂O:Tb³⁺ demonstrates real-time X-ray imaging with a resolution of 9.5 lp mm⁻¹. These results suggest the potential application prospect of Cs₂ScCl₅·H₂O:Tb³⁺ in X-ray detection and imaging.