Mechanistic‐Driven, Phosphorescence‐Enhanced HOF‐Based Bionic Dual‐Channel Sensor for Precision Bimodal Monitoring of Displacement and Angle Enabled by Photon Flux Modulation

Abstract

ABSTRACT Recent years have witnessed growing interest in flexible luminescent devices for physical stimulus sensing, with numerous studies exploring the coupling between film deformation and external physical fields. However, the direct mechanism connection between macroscopic physical motion and the resulting luminescent response has remained elusive. Herein, a phosphorescence‐enhanced hydrogen‐bonded organic framework‐based cotton fiber film (PBA@TPA‐PEA@CF)—fabricated via spraying method—was integrated with a self‐built mechanically actuated platform to construct a fluorescence‐phosphorescence dual‐channel sensing system. This insect antennae‐inspired sensing system enables high‐speed, high‐sensitivity, and high‐precision measurement of displacement and angular rotation. Crucially, displacement and angle function not merely as input parameters but as intrinsic transduction variables that directly couple mechanical input to optical output. Opto‐mechanical coupling simulations uncover a previously unrecognized mechanism for physical stimulus luminescence sensing: mechanical motion dynamically modulates both the incident photon flux and effective optical density, thereby governing luminescence intensity variations in a deterministic, reversible manner. Practical utility in two distinct applications was further achieved: (i) real‐time, noncontact monitoring of robotic arm kinematics via smart wearable textiles, and (ii) a reversible, motion‐triggered luminescent switch. This work establishes a mechanism framework for mechanical luminescence conversion, paving the way for next‐generation, precision‐oriented flexible luminescent sensors tailored for advanced physical sensing.