Flexible Mechanical Response Device With Optical Logic Emission Enabled by Synergistic Crystallization Engineering of Ester Polymer and Perovskite

Abstract The flexible mechanical response device (FMRD) is developed using a stretchable perovskite light‐emitting diode. The FMRD achieves optical logic light‐emitting properties through a synergetic crystallization strategy involving a highly crystalline ester‐based polymer (hc‐ester) and perovskite. Research indicates that hc‐ester polymer influences the crystal growth of perovskite via ion‐dipole interaction, resulting in “crystallized space confinement.” Perovskite space confinement further optimizes perovskite's sub‐dimensional crystal phase ratio, enhancing exciton transmission efficiency and luminescence performance. Additionally, hc‐ester enhances the surface morphology of perovskite films and lowers the electron trap density, demonstrating significant potential for use in optoelectronic devices. Regarding its application, FMRD can generate optical logic signals through external force deformation, such as bending and stretching, making it useful for motion capture and mechanical stress sensing. In the bent state, FMRD shows an increase in luminance, a blue shift in emission, and improved external quantum efficiency, making it suitable for dynamic analog signal source output. At the same time, its reversible spectral changes and consistent variations in luminescence make it exceptional for mechanical stress sensing applications. This research presents an innovative, flexible optoelectronic device technology solution and paves the way for new applications of perovskite composite materials in optical logic devices and intelligent sensing.