Pixel‐Level X‐Ray to NIR Image Fusion Based on Lead‐Free Halide Perovskite for Biological Imaging

ABSTRACT Combining information from different images for multispectral image fusion can enhance human or machine perception. Nowadays, various luminescent materials with different spectral responses are used for image fusion, but this requires complex algorithms and systems to address pixel and position mismatches. Using a single luminescent material to obtain multispectral imaging can effectively avoid pixel mismatch and complex imaging processing. Herein, we report efficient blue‐light‐excitable ultrabroadband white emission and near‐infrared (NIR) emission in the Te 4+ /Mo 4+ ‐codoped Cs 2 ZrCl 6 with a luminous efficiency of 94.2% (NIR region: 52.6%). Moreover, this compound also shows bright radioluminescence with a light yield of 55 000 photons/MeV in the visible light region. Benefiting from these fascinating optical properties, high‐performance single‐component white light‐emitting diode (WLED), NIR LED, and X‐ray scintillator were fabricated based on Te 4+ /Mo 4+ ‐codoped Cs 2 ZrCl 6 /polydimethylsiloxane flexible film. Particularly, we took bullfrog palm as the target object, and demonstrated its applications in white light imaging, NIR imaging, and X‐ray imaging, respectively. Without pixel mismatch and complicated imaging processing, the pixel‐level X‐ray to NIR image fusion was realized, which can not only observe the wound of bullfrog palm, but also clearly obtain the structure and distribution of blood vessels and skeleton textures under the skin tissue of bullfrog palm.