Breaking the Cross‐Sensitivity Limit: Simultaneous Stress and Temperature Dual‐Mode Sensing Via Colorimetric Mechanoluminescence in SrF2:Eu2+,Sm3+

Abstract

Mechanoluminescent (ML) materials have emerged as promising candidates for self‐powered sensing systems, yet the simultaneous decoupling of stress and temperature remains a critical challenge. Here, a novel Eu2+,Sm3+ co‐doped SrF2‐based ML material is presented that enables orthogonal stress‐temperature dual‐parameter sensing through a triboelectricity‐driven ML mechanism. By leveraging the distinct emission behaviors of Eu2+ (350–550 nm) and Sm3+ (550–750 nm), the integrated ML intensity exhibits a linear response to stress, while the ML intensity ratio of Eu2+ and Sm3+ follows an exponential correlation with temperature, yielding high maximum absolute (0.162 K−1) and relative (0.05%·K−1) sensitivities. Crucially, this material exhibits a unique ML property: ML color changes exclusively with the single parameter ‐ temperature, while the integral ML intensity corresponds to the magnitude of force. Thus, using OpenCV visual recognition, temperature signals can be independently decoupled within a complicated force‐temperature conditions, eliminating cross‐sensitivity. A graded alarm system based on Hue, Saturation and Value chromaticity analysis validates its capacity of real‐time, non‐contact temperature monitoring in simulated industrial scenarios. This work establishes a paradigm for dual‐mode optical decoupling in ML materials, advancing applications in precise perception of various parameters in a multi‐physics field coupling environment.