Reversible Stress‐memory Phosphorescent Carbon Nanodots via Supramolecular Confinement Engineering for Aerospace Monitoring

Abstract The development of mechano‐responsive room‐temperature phosphorescent (RTP) materials with reversibility and durable memory stress‐recording capability remains a critical challenge, particularly under extreme operational conditions where covalent bond‐dependent systems often suffer from irreversible degradation. Herein, a hydrogen‐bond‐induced dynamic supramolecular confinement framework is constructed to achieve cyclodextrin‐trapped carbon nanodots (CNDs) with reversible and memorable mechano‐responsive RTP. Mechanical stress disrupts the metastable hydrogen‐bond network and weakens phosphorescence via enhanced non‐radiative decay of triplet excitons. Remarkably, the system exhibits a recovery of RTP intensity through ultrasonic reconstruction of the rigid cyclodextrin matrix. When deployed in aerospace structural health monitoring, the CND‐embedded film visualizes stress distribution in wings under sudden stress events through RTP weakening. This work establishes a non‐destructive monitoring paradigm for an extreme aerospace environment.