Designing Photochromic Materials With Specific Coloration Responses for Spectrally‐Selective Radiation Dosimetry

Photochromic materials exhibiting specific coloration responses are in high demand for spectrally‐selective radiation dosimetry, while it remains a challenge for existing materials. Herein, this study introduces a new approach to modulating the dosimetric characteristics of BaMgSiO 4 by leveraging the synergistic interplay between compositional regulation (cobalt ion doping) and synthesis process optimization. The synthesized material demonstrates a broad spectrum of photochromic hue variations—ranging from pink, yellow, gray, to gray‐green—contingent upon their composition and the atmosphere conditions of synthesis. Analyses utilizing thermoluminescence and electron paramagnetic resonance substantiate that the observed chromatic variations are attributable to the introduction of novel trap states via cobalt doping, which modifies the characteristics of F‐centers. The BMSO:Co‐Air sample exhibits a pronounced selective reactivity to high‐energy electromagnetic radiation, specifically in the UVC and X‐ray. This selective energy response can be ascribed to the dynamics of trap modulation and the processes involved in trap occupation. The practical utility of BMSO:Co‐based materials is demonstrated through the fabrication of multichromatic patterns, wearable photochromic fabrics, and prototype colorimetric dosimeters. This work not only provides an advanced photochromic dosimeter for spectrally‐selective UV dosimetry but also offers guidance for the development of photochromic materials with specific coloration behaviors.