Dual-Functional X-Ray Photochromic Phosphor: High-Performance Detection and 3D Imaging

This study explores the integration of X-ray-induced photochromism and photoluminescence in a single material, offering innovative multi-mode applications in optical memory, anti-counterfeiting, and X-ray detection and imaging. The photochromic phosphor LiAlSi 2 O 6 :Sm 3+ is synthesized, which undergoes a color change from white to dark green under bright field conditions and displays orange photoluminescence in dark field conditions after X-ray exposure due to defect formation. The phosphor shows accelerated bleaching and recovery under 473 nm laser stimulation. The distinct X-ray-induced color contrast and luminescence intensity modification in LiAlSi 2 O 6 :Sm 3+ highlight its potential in advanced luminescent material design. Moreover, a LiAlSi 2 O 6 :Sm 3+ -based flexible film demonstrates “dual-mode” 3D X-ray imaging and detection capabilities, paving the way for future X-ray detecting and imaging device research.