Flexible organic light emitting diode ribbons using three liquid organic semiconductors

We propose ribbon type flexible organic light emitting diodes (OLEDs), which can be integrated into textiles, using liquid organic semiconductors (LOSs). A linear flexible microchannel, which consists of a liquid light-emitting layer with LOS sandwiched between two indium tin oxide (ITO) electrodes, was fabricated with photolithography and heterogeneous bonding. LOSs were injected into the SU-8-based linear microchannels of 70 mm in length. Three different colors of photoluminescence (PL) emission were observed from flexible linear microchannels. Liner electroluminescence (EL) emission was successfully obtained in a bending state as well as straight state. We expect that the proposed microfluidic OLED ribbons will have high potential for future free-formable wearable devices such as electronic textiles.