3D Printing of Deformable Multicolor Alternating‐Current Electroluminescent Devices Through Rational Design of Functional Inks

Abstract The development of flexible and customizable electroluminescent devices represents a significant challenge in advanced manufacturing. This paper introduces a novel approach for fabricating highly deformable, fully 3D‐printed alternating‐current electroluminescent devices through the rational design of UV‐curable functional inks. The devices feature a unique multilayer structure including a UV‐curable thiol‐ene crosslinked emission layer (ZBS‐t‐SE) and temperature‐responsive ionic hydrogel electrodes (FFP). The ZBS‐t‐SE demonstrates exceptional mechanical properties, with a strain of 259% at 727 kPa, whereas the FFP electrodes exhibit excellent printability through controlled micelle formation, high ionic conductivity (2.5 × 10⁻ ² S cm ⁻¹ ), and stable performance under repeated deformation (>3000 cycles at 200% strain). The optimized devices maintain stable operation under various deformation modes, including stretching, bending, and twisting, achieving a maximum luminance of 267.4 cd m ^{− 2} at 200% strain. Furthermore, the 3D printing approach enables the fabrication of complex 3D structures with multi‐color emission through precise spatial control of functional materials, presenting a transformative strategy for next‐generation flexible electronics and display technologies.