Design of Visualized Ratiometric Mechanoluminescent Materials for High‐Resolution Pressure Sensing

Abstract Optical sensing technology based on mechanoluminescent (ML) materials offers advantages such as rapid response, real‐time monitoring, visual signal output, and multi‐functional sensing, making it promising for various applications. However, traditional sensing techniques based on the absolute intensity of ML suffer from issues of low accuracy and large errors, which have a significant impact on the reliability and visual effectiveness of the sensor. To address these problems, this study employs a ratiometric ML pressure sensing method. By utilizing the primary color recognition of human cone cells, transition metal ion Mn²⁺ and rare earth ion Tb³⁺ are selected as luminescent centers. The rich intermediate colors ensure a wide range of colors that are easily distinguishable by the human eye. Through studies involving mechanical stimulation and similar high‐energy radiation, it is confirmed that the differences in sensitivity between rare earth ions and transition metal ions, as well as the contributions of shallow trap states, are the reasons for the dynamic changes in the ratiometric ML intensity. Finally, a conceptual application of pressure sensing is realized by combining homogeneous gas compression with pipeline monitoring for dynamic visualization, self‐referencing, and high‐precision mechanical sensing.