Self‐Powered High‐Frequency Excited ZnS Electroluminescent Fibers for Wearable Visual Interaction

ABSTRACT ZnS electroluminescent (EL) fibers currently serve as a crucial component in smart wearable flexible electronic devices. While offering advantages such as excellent flexibility and low power consumption, these fibers still require external high‐frequency power to excite luminescence, which limiting their potential in portible and wearable interaction applications. To address this challenge, triboelectric generators (TEG) are employed to effectively harvest electrical energy by converting mechanical energy. The TEG, inspired by origami structures, achieves a maximum output voltage of 228 V, current of 22 µA, and power density of 0.4 W m −2 , maintaining excellent performance even after 50 000 compression cycles. The ZnS EL fibers with a coaxial structure of the dielectric and luminescent layers are realized via the microfluidic spinning technology, which has a special advantage in the precise control of the microstructure. Most importantly, a novel energy management circuit is proposed to convert TEG energy into high‐frequency alternating current (AC) for driving the EL fibers, which possess a brightness of up to 150.88 cd m −2 under the lower output of TEG. Ultimately, a self‐powered, highly luminous ZnS EL fiber with an integrated energy management circuit and TEG has been developed, which makes it possible to provide energy for luminescent fibers through the common mechanical friction.