Coplanar Pattern and Temperature Transient Control in Intelligent Wearable Multi‐Color Alternating Current Electroluminescence Devices

Abstract Flexible alternating current electroluminescence (ACEL) devices integrated into textiles are gaining significant attention for their potential in lighting displays and health monitoring applications. Traditional challenges include high‐voltage “breakdown” and limited color output due to the inherent properties of ZnS:Cu. This study introduces a novel multi‐color ACEL device featuring a fluorescent dye color conversion layer alongside a robust protective layer designed to enhance device stability. The optimal ratio of dielectric layer concentration and protective layer thickness is systematically investigated to mitigate the risk of “breakdown”. Utilizing the principles of photoluminescence and electroluminescence, luminous electronic textile devices is successfully developed that exhibit both purple and green luminescence. Additionally, integration with a temperature sensor enables the device to serve as a health‐monitoring tool by signaling changes in body temperature. This research delineates the protective capabilities of the protective layer and the efficacy of the color conversion mechanism in maintaining consistent brightness under various conditions. The findings suggest a viable pathway for broadening applications and potentially accelerating the commercialization of wearable electroluminescent technologies.