Stretchable Multicolored Electroluminescent Sound Display for Wearable and Interactive Textiles

Abstract This study develops a novel stretchable electroluminescent (EL) sound display to address the challenges of limited stretchability and low brightness in existing EL displays. By synergistically utilizing transparent ionogel electrodes and a high dielectric layer composed of Ecoflex, Triton X, and inorganic EL phosphor, an innovative sound display that seamlessly translates auditory information into optical signals is developed. The strategic incorporation of Triton X in the emissive layer induces polarization and plasticization of Ecoflex, resulting in a high dielectric constant, minimal leakage current, and superior stretchability. This design, featuring stretchable transparent ionogel electrodes sandwiching the high‐dielectric‐constant emissive layer, enables facile fabrication of stretchable sound displays that demonstrate unprecedented performance: exceptional brightness, stretchability, and acoustic output. Remarkably, both the electroluminescence and acoustic performance of the display remain stable under various types of mechanical deformations. Furthermore, a stretchable multicolored textile sound display that can be pixelated, achieving remarkably stable light and clear sound generation even when it is stretched, capable of illuminating letters, emitting various colors of light, and generating sound simultaneously without performance degradation is demonstrated. This groundbreaking approach opens new avenues for human–machine interface applications, particularly in wearable displays and smart textiles, enabling intuitive communication in next‐generation interactive systems.