MPa-Level Piezochromic Excimer Switching for Self-Erasing Visual Encryption.
Piezochromic fluorescence usually requires high pressure and often suffers from intensity quenching, limiting its utility in encryption and optical security. Here we uncover a previously unrecognized MPa-level dynamic excimer-switching mechanism in 9-phenylanthracene (An-Ph) microcrystals, enabled by pressure-induced r...