Light-Written Reversible 3D Fluorescence and Topography Dual-Pattern with Memory and Self-Healing Abilities

To achieve the dynamical dual-pattern with multiplex information of complex topography and 3D fluorescence is challenging yet promising for wide applications ranging from visual bioassays,memory,smart devices to smart display.Here,we develop a convenient,reliable,and versatile method to realize the well-ordered dual-pattern with reversible topography and 3D fluorescence via a light direct-writing approach based on the wrinkle mechanism.By introducing the charge transfer(CT)interaction betweenπ-electron-rich anthracene(AN)andπ-electron-poor naphthalene diimide(NDI)into the polymer system,both modulus and fluorescence of the polymer films can be spatially regulated through the photodimerization of AN,which is controlled in-plane by photomasks,and becomes gradient in the vertical direction due to the filter effect of light.Therefore,the exposed sample displays a well-ordered complex pattern with the same topography as the applied photomask and 3D gradient change of fluorescence from red to green laterally across the layers simultaneously.The spatial cross-linking and CT interaction of the gradient layer can be controlled independently,which not only provides the reliability and reversibility of the topographical and fluorescence dual-pattern but also endows the possibility for tailoring the pattern with memory and selfhealing.These characters of the dual-pattern with reversible topography and 3D fluorescence declare the clear applications in smart multiplex displays,memory,anticounterfeiting,visual detections,and so on.