Self‐Erase Force‐Induced Turn‐On Organic ASE Output Cryptographic Primitive for Advanced Multiple Information Encryption

Abstract The development of high density and security information encryption system, in particular narrowband luminescence cryptographic primitive, is of notable significance but extremely challenging for anticounterfeiting applications. Herein, a novel piezochromic fluorescent (PCF) molecule 4‐(4‐(4‐methylpiperazin‐1‐yl)styryl)‐ N , N ‐diphenylaniline (TPIZ) is reported, which features high pressure sensitivity and self‐erase force‐induced amplified spontaneous emission (ASE) output multicolor switching. The remarkable green/cyan photoluminescence emission and blue ASE emission of TPIZ microcrystals can be switched reversibly under pressure and pumping energy. A mechanistic study of X‐ray diffraction analysis reveals that the rotation of the C═C bond under low pressure caused the reduction of the weak intermolecular interaction, which is responsible for its excellent PCF performances with self‐erase features. Moreover, the force‐induced amplification of ASE output behaviors are observed due to the high quality of TPIZ microcrystals. Benefiting from the pressure sensitivity, ASE emission as well as self‐erase behaviors of TPIZ microcrystals, a triple encoding self‐erase system is developed for advanced information encryption. This work can provide a crucial step toward the force‐induced narrowband ASE cryptographic primitive materials for high level security application.