Integrating organic light-emitting diode and field-effect-transistor in a single device

We have investigated organic light-emitting diodes (OLEDs) with a structure of field-effect-transistor (FET) using MgAg as source and drain electrodes, respectively. These devices were found to present both a typical switchable behavior of FET and an electro-optical transfer characteristic of OLEDs. Five organic layers were employed in devices that were expected to play each role for OFET and OLED, respectively. In a result, the FET unipolar behavior has been demonstrated experimentally. Furthermore, FET characteristics were discussed based on an equivalent circuit.