Novel Approach for Alternating Current (AC)-Driven Organic Light-Emitting Devices

A novel approach for alternating current (AC)-driven organic light-emitting devices is reported, which uses the concept of molecular doping in organic semiconductors. Doped organic charge-transport layers are used to generate charge carriers within the device, hence eliminating the need for injecting charge carriers from external electrodes. Bright luminance of up to 1000 cd m-2 is observed when the device is driven with an AC bias. The luminance observed is attributed to charge-carrier generation and recombination, leading to the formation of excitons within the device, without injection of charge carriers through external electrodes. A mechanism for internal charge-carrier generation and the device operation is proposed.