Stimuli‐Selective Charge Trapping in Cs ₃ Cd ₂ Cl ₇ :Mn ²⁺

ABSTRACT

The ability to store and release charge carriers in response to external stimuli is fundamental to advanced technologies in radiation detection, imaging, and sensing. However, combining good sensitivity with multimodal functionality in a single material has remained challenging. Here we report that Mn ²⁺ ‐doped Cs ₃ Cd ₂ Cl ₇ exhibits dual‐mode charge storage depending on the stimulation pathway. Under X‐ray irradiation, the material stores energy in multiple defect states, producing six thermoluminescence (TL) glow peaks between 141 and 450 K. The integrated TL intensity is ∼4.7 times higher than that of the commercial X‐ray storage phosphor BaFBr(I):Eu ²⁺ , demonstrating good sensitivity suitable for temperature‐resilient radiography. In contrast, mechanical grinding of the same crystals in an agate mortar induces a distinct charge trapping behavior, generating two TL peaks at approximately 445 and 607 K. This force‐induced charge storage enables the recording of mechanical events for delayed readout, offering a pathway for non‐real‐time force sensing. The same material thus serves dual functions, delivering bifunctional X‐ray imaging and mechanical force recording through distinct energy release pathways. Our findings establish Cs ₃ Cd ₂ Cl ₇ :Mn ²⁺ perovskite as a stimuli‐responsive platform and open opportunities for multimodal sensing technologies where both radiation and mechanical histories can be stored and retrieved on demand.