Efficient blue-light-excitable broadband NIR emission in Mo4+-doped double perovskite with robust thermal stability and efficient X-ray scintillation for pixel-level X-ray to NIR image fusion

• • Mo4+-doped Cs2(Na0.4Ag0.6)InCl6 achieves near-unity photoluminescence quantum yield (PLQY) under blue-light excitation, enabling efficient NIR emission for high-brightness light sources and imaging applications. • • The material retains 84% of its initial emission intensity at 420 K compared to 300 K, demonstrating robust thermal stability critical for operation in high-temperature environments without significant performance degradation. • • Under X-ray irradiation, the material exhibits a high light yield of 39,400 ± 1100 photons/MeV, positioning it as a competitive scintillator for X-ray imaging with sensitivity comparable to commercial options. • • The flexible PDMS composite film enables pixel-level fusion of NIR and X-ray images without spatial mismatch, eliminating the need for complex computational algorithms and reducing processing load in multispectral imaging systems.