Orthogonal Stimulus‐Responsive Ca ₃ Ga ₂ Ge ₃ O ₁₂ : Pr ³⁺ for Real‐Time X‐Ray Dosimetry and Dynamic Information Encryption

ABSTRACT Multimodal luminescent materials are crucial for advanced information encryption, real‐time dosimetry, and high‐resolution bioimaging, yet integrating orthogonal stimulus‐responsiveness into a single‐component system is challenging. Herein, we report a Pr 3+ ‐doped Ca 3 Ga 2 Ge 3 O 12 (CGGO: Pr 3+ ) garnet phosphor that exhibits orthogonally addressable luminescence under ultraviolet (UV) light, X‐ray radiation, and thermal stimulation. This phosphor demonstrates dual spectrally distinct emissions with relative intensities that can be precisely modulated by varying the excitation wavelength or ambient temperature, enabling color tuning from blue to orange. Furthermore, time‐resolved multi‐color afterglow after UV or X‐ray pre‐excitation, along with thermally stimulated luminescence, provides complementary readout channels. Notably, CGGO: Pr 3+ exhibits dose‐rate‐ and temperature‐dependent color evolution (from blue‐white to orange‐white) under concurrent UV and X‐ray irradiation, facilitating real‐time naked‐eye monitoring of both X‐ray dose rate and temperature. By leveraging these orthogonal response modes, we demonstrate visual real‐time X‐ray dose and temperature detection, high‐security X‐ray imaging, and 3D‐encrypted quick response codes. This study establishes CGGO: Pr 3+ as a versatile single‐component platform for orthogonal stimuli‐responsive applications, advancing the fields of dynamic information encryption and instantaneous X‐ray dose‐rate visualization.