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Liquid flow sensor is an important component of the microfluidic system for analytical science and biomedical systems. However, traditional microfluidic systems are complex in structure, costly, bulky, and generate environmental pollutants. Herein, a novel and high‐performance self‐powered all‐optical liquid flow sensor (ALFS) based on triboelectrification‐induced electroluminescence (TIEL) is proposed...