Intrinsically Stretchable Full-Color Light-Emitting Films via Elastomer Blend for Polymer Light-Emitting Diodes

For skin-like display, intrinsically stretchable light-emitting materials are key components. However, the previously reported materials have been still restricted super yellow series materials, which could be emitting just green-like yellow lights. Therefore, three primary light-emitting materials such as red, green and blue (RGB) are necessary to develop skin-like full-color displays. Herein, we report highly stretchable three primary light-emitting films enabled by polymer blend between conventional RGB light-emitting polymer semiconductors and a non-polar elastomer (SEBS). Through nano-phase separation, these films are composed of multi-dimensional nanodomains that are interconnected in an elastomer matrix for efficient charge transport and light-emitting performance under strain. The polymer light-emitting diode (PLED) exhibited over 1,000 cd/m² luminance with low turn-on voltage (< 5 V_on) and the stretched blend films on rigid substrate preserved their light-emitting performance up to 100% strain even after 10,000 multiple stretching cycles.