Soft Confinement Couples Shape Morphing With Persistent Phosphorescence in Liquid Crystal Networks

ABSTRACT Biological systems regulate molecular functions by coupling local confinement with dynamic structural reconfiguration. Translating this principle to govern excited‐state dynamics in soft materials remains challenging, as conventional photophysical stabilization relies on rigid matrices that conflict with macroscopic deformability. Here, we introduce a liquid crystal network‐based soft‐confinement strategy that reconciles these characteristics. Ordered mesogenic domains establish soft confinement that stabilizes triplet excitons through dispersion‐driven π–π interactions while preserving thermally induced network reorganization. Consequently, the material synchronizes microscopic phosphorescence regulation with macroscopic shape morphing under a unified structural transition. The platform enables persistent room‐temperature phosphorescence (RTP) in seven polycyclic aromatic hydrocarbons (PAHs), achieving a triplet lifetime of 5.12 s and a phosphorescence quantum yield of 26.80% under ambient conditions. Theoretical calculations and structural characterization indicate that soft confinement plays the dominant role in exciton stabilization, while long‐range order further suppresses oxygen quenching. Additionally, the material exhibits reversible deformation–phosphorescence switching over 200 thermal cycles and can be processed into fibers, films, and microspheres for dynamic photonic writing and time‐domain information encryption. This work establishes adaptive soft confinement as a pathway for coupling excited‐state regulation with macroscopic mechanical functionality.