Dynamic Assembly‐Induced Time‐Resolved Optical Switches for Rewritable Advanced Information Encryption

Abstract The development of photocontrolled assembly of smart materials with time‐dependent optical characteristics is a promising strategy to fabricate multiple optical materials for advanced information encryption. Herein, this work reports the integration of photochoromic spiropyran and square‐planar platinum(II) as a photocontrolled switching motif that endows the materials with dynamic assembly‐induced optical characteristics. Importantly, the time‐resolved multilevel optical switching processes have been achieved based on the synergism of the reversible photochoromism and fluorescence resonance energy transfer (FRET) processes through regulating the intramolecular isomerization and intermolecular self‐assembly processes. The excellent temporal multicolor features promote the photocontrolled switches as a promising candidate for time‐resolved confidential materials including multilevel displays and dynamic 4 dimension (4D) codes, with the achievement of relative encrypted data that can only be identified at a specified time. This synergistical strategy for constructing advanced materials provides an inspiring guidance for information encryption with higher security requirements.