Flexible X‐Ray Detector for Cumulative Dose Monitoring Through Reversible Photochromism and Luminescence Modulation

This study presents a multi-mode X-ray detection and imaging strategy by integrating photochromism, photoluminescence, and radioluminescence into Tb³⁺-doped CaAl₂Si₂O₈. CaAl₂Si₂O₈: Tb³⁺ exhibits stable radioluminescence, oxygen vacancy-related photochromism, and photoluminescence modulation, all of which showed a linear relationship with X-ray exposure. This multi-mode response enables high-quality imaging and detection in both bright and dark conditions, facilitating time-dependent cumulative X-ray radiation dose assessments. Reversible color and luminescence changes are achieved through cyclic tests involving alternating X-ray and 473 nm laser irradiation. The PDMS CaAl₂Si₂O₈: Tb³⁺ ink and flexible film demonstrate high suitability for wearable X-ray detection devices and imaging of irregular objects, offering an innovative approach to X-ray detection and imaging.