Oxygen‐Acceptor‐Driven High Photochromic Contrast Solid‐State Excited‐State Intramolecular Proton Transfer Photoswitches

>74). Kinetic studies suggest that tpmSA can undergo rapid photoisomerization and is capable of reversible switching for over 20 cycles, demonstrating superior fatigue resistance. Mechanistic studies reveal that the weakly alkaline oxygen-acceptor in tpmSA significantly enhances photochromic contrast by suppressing the ground-state intramolecular proton transfer (GSIPT) pathway. The photopatterning and high-level information encryption were successfully developed by tpmSA. This study proposes an oxygen-acceptor strategy for developing solid-state photoswitches with high photochromic contrast, demonstrating great potential for advanced information encryption materials.