Flexible Double-Sided Light-Emitting Devices Based on Transparent Embedded Interdigital Electrodes

In the areas of flexible displays and wearable devices, double-sided light-emitting devices have huge commercial applications. Here, we provide a novel form of flexible double-sided light-emitting devices by designing and manufacturing different transparent interdigital electrodes for lighting the structural areas of composite emitting layers. The transparent interdigital electrodes are fabricated by embedding multiwalled carbon nanotubes in interdigital mesh-structured microcavities using a doctor-blading process, and the emitting layers are fabricated by mixing copper-doped zinc sulfide (ZnS/Cu) phosphor particles with the transparent polydimethylsiloxane polymer. The fabricated double-sided light-emitting devices could be in the crimp state, exhibiting excellent flexibility. By designing the structure of the interdigital electrodes and the thickness of the emitting layers, the double-sided emission intensity of the light-emitting devices can be adjusted. Furthermore, based on the flexible double-sided light-emitting devices, various patterns can be successfully programed, such as the digital, grayscale, and ancient Chinese walls. The flexible and programmable double-sided light-emitting films provide a promising strategy for the next generation of customized flexible displays.