Direct‐Write Printing of Multicolor Electroluminescent Films for Stretchable Display

Abstract Electroluminescent (EL) films are promising light sources for flexible displays, wearable electronics, and soft machines. Traditional fabrication methods like thermal lamination, transfer printing, and screen printing are often labor‐intensive. To address these challenges, a mask‐free, fully printable alternating‐current electroluminescent (PACE) film using a direct‐write printing strategy is presented. This method simplifies fabrication, enhances design flexibility, and allows precise, layer‐by‐layer deposition without alignment issues. The multicolor PACE film, available in blue, green, and orange, reaches a thickness of ≈150 µm and achieves 180 cd m⁻ 2 at 6 V µm⁻¹. It stretches up to 180% and withstands 10 000 bending/stretching cycles without significant luminance loss. Compared to conventional EL devices, the approach offers similar brightness with thinner films, avoids UV‐curable elastomers, and reduces equipment needs. This innovation broadens design possibilities, especially for stretchable displays, making it ideal for rapid prototyping with computer‐aided design (CAD) tools.