Mechanoluminescence (ML) materials can convert mechanical stimuli into visible signals for real-time visualization of stress sensing. Since stress sensing solely based on ML absolute strength is susceptible to the external environment, ratiometric ML detection approach is expected to provide stress description with improved accuracy and stability. In this study, a stress-dependent ratiometric ML is achieved using the Eu²⁺ and Mn²⁺ co-doped SrMg₂(PO₄)₂ (SMP) phosphors, enabling color-resolved visualization of uploaded stress stimulus. Moreover, the linear relationship between the ML intensity ratio (MLIR) and the applied stress leads to an obvious variation in ML color upon different applied stress. Herein, the as-explored ML composites films as an artificial skin could provide a visualization and quantification tool for monitoring human knee motion with great accuracy and precision.

中文翻译：

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Eu 和 Mn 共掺杂 SrMg2(PO4)2 的颜色分辨机械发光

机械发光（ML）材料可以将机械刺激转换为可见信号，以实现压力传感的实时可视化。由于仅基于 ML 绝对强度的应力感测容易受到外部环境的影响，因此比例式 ML 检测方法有望提供更高准确性和稳定性的应力描述。在本研究中，使用Eu ²⁺和Mn ²⁺共掺杂SrMg ₂ (PO ₄ ) ₂ (SMP) 荧光粉实现了应力依赖性比例ML ，从而实现了上传应力刺激的颜色解析可视化。此外，ML强度比（MLIR）与施加的应力之间的线性关系导致ML颜色在不同的施加应力下发生明显的变化。在此，所探索的 ML 复合材料薄膜作为人造皮肤可以提供可视化和量化工具，用于高精度地监测人体膝盖运动。