Arbitrary Shape Designable Microscale Organic Light-Emitting Devices by Using Femtosecond Laser Reduced Graphene Oxide as a Patterned Electrode

Arbitrarily shape customized microscale organic light-emitting devices (micro-OLEDs) have been fabricated by using reduced graphene oxide (RGO) film as a patterned electrode. A femtosecond (Fs) laser was employed to fabricate the RGO electrode by direct reduction and patterning of the GO films according to preprogrammed patterns. The patterned RGO exhibits good conductivity for electrode applications in OLEDs. Various complex patterned Micro-OLEDs were successfully created through this simple Fs laser fabrication process, which exhibit well-defined sizes, shapes, and edges and uniform electroluminescence characteristics. The arbitrarily shape customized micro-OLEDs open the door for new applications in microdisplays and three-dimensional or flexible displays.