Interfacial High‐Energy Driven Resultant Mechanoluminescence: Spectral Evidence and Promising Applications

Developing new mechanoluminescence (ML) materials serves as a powerful approach for probing the fundamental mechanism of interfacial interactions dominated resultant ML. Herein, a novel resultant ML composite, Mg 3 (PO 4 ) 2 :Eu/polydimethylsiloxane (PDMS), was developed, exhibiting bright green emission with outstanding durability over thousands of stretching cycles. Spectroscopic analyses in terms of photoluminescence (PL), cathodoluminescence, x‐ray excited luminescence, and ML reveal that the green emission should be attributed to the generation of dynamic Eu 2+ triggered by free electrons, providing solid evidence for the hypothesis that the interfacial peeling process generates free electrons. Thermoluminescence spectroscopy results further confirm that the interfacial peeling involves a high‐energy process capable of inducing new radiation defects within the phosphor lattice, based on which the interfacial high‐energy driven resultant ML model is proposed. Moreover, the multi‐mode luminescence, combining ultraviolet‐induced red PL and green ML, is utilized for advanced encryption and self‐powered mechanics sensing.