Stretchable Mechano‐Electro‐Optical Coupling Devices

Abstract Flexible multi‐signal coupling devices are essential for intelligent sensing and information processing. However, the development of stretchable multi‐signal coupling devices remains challenging. Herein, a sandwich‐structured, stretchable mechano‐electro‐optical coupling (MEOC) device is introduced that outputs both electrical and optical signals during mechanical stretching. A nanometer‐thick gold film is deposited on both sides of a stretchable electroluminescent layer, facilitating the reversible formation of microcrack networks during stretching. These microcrack networks exhibit strain‐dependent changes in electrical resistance and optical transmittance, which modulate the device's electrical and optical outputs. The MEOC device achieves an ultralow strain detection threshold of 0.05% and high stretchability up to 80%. Two variations of the MEOC device with thickness‐patterned electrodes are designed and demonstrated for dynamic information encryption and decryption. As a proof of concept, a stretchable MEOC device is used for joint‐based health management, showcasing its potential in sensing and display applications. This stretchable multi‐signal coupling device holds significant promise in dynamic information displays and interactive devices.