Photo‐Controlled Reversible Multicolor Room‐Temperature Phosphorescent Solid Supramolecular Pseudopolyrotaxane

Abstract The photoreversible switch persistent room‐temperature phosphorescent (p‐RTP) system is attractive but challenging in the field of smart luminescent materials. In particular, those p‐RTPs with the excitation‐wavelength‐responsive and time‐dependent multicolor emission are very important but underexplored. Herein an excitation‐wavelength‐responsive and time‐dependent multicolor p‐RTP emission pseudopolyrotaxanes supramolecular system based on host–guest interaction between α‐cyclodextrin (α‐CD) and two luminophores (benzene and naphthalene) modified polyethylene glycol (PEG) derivatives is reported. The excitation‐wavelength‐responsive and time‐dependent multicolor afterglows of the supramolecular system are derived from the diverse p‐RTP emission species with different lifetimes. More importantly, the p‐RTP can be reversibly adjusted by photoisomerization of diarylethylene (DAE), that is, it could be erased under ultraviolet light and recovered under visible‐light for several cycles. Taking advantage of the reversible photoencryption property, this intelligent luminescence supramolecular system has broad application prospects in information storage and treatment.