Highly Crystallized Transparent Composite for Cooperative Imaging

Highly crystallized glass composites rarely retain high optical transparency while supporting efficient near‐infrared (NIR) emission and strong x‐ray response. Here, a highly crystallized Cr 3+ ‐doped transparent glass composite is reported that breaks this conventional compromise, delivering an optical transmittance exceeding 80% and a near‐unity internal quantum efficiency of 98.5%. Under x‐ray excitation, the glass composite exhibits a radioluminescence (RL) intensity five times that of Bi 4 Ge 3 O 12 and shows thermally enhanced RL, reaching 105% of its room‐temperature intensity at 150°C. This functionality is further extended to fiber form, where NIR glass composite fibers are realized. High‐resolution x‐ray imaging is achieved with a spatial resolution of 27 lp mm −1 , while integration of optical and x‐ray excitation pathways further enables cooperative dual‐modal imaging with complementary contrast and enhanced information depth. These results demonstrate a viable strategy for integrating optical transparency, NIR emission and x‐ray response within a single material platform, supporting advanced photonic and imaging applications.