Red-emitting Cs2NaScCl6:Sm flexible films for high-resolution X-ray imaging

Abstract

In recent years, the development of new scintillation materials with red and near-infrared light emission has had significant advantages based on the development of an avalanche photodiode with high quantum yield. This study used a hydrothermal method to synthesize rare-earth-doped Cs₂NaScCl₆ crystals, in which a red emission of Cs₂NaScCl₆:Sm was investigated with high X-ray sensitivity and low detection limit. In addition, a tunable wavelength range of radioluminescence can be achieved, in which a near-white light emission can be generated by precisely controlling the proportion of Sm³⁺ and Tb³⁺ doping concentrations. Meanwhile, a Cs₂NaScCl₆:7%Sm scintillation film has been successfully prepared by direct coating with a thickness of 150 μm, which achieves a spatial resolution of 11.9 lp mm⁻¹ based on X-ray imaging experiments. Therefore, this perovskite material has shown potential application as an eco-friendly multifunctional imaging material.