High Efficiency Alternative Current Driven Organic Light Emitting Device

In this work, we introduce the use of field-activated organic light emitter, coupled with a semiconducting gate electrode to create a novel, highly efficient lighting device. A layer of ZnO nanoparticles between the interface of an ITO contact and a PEDOT:PSS injection layer facilitates impressive control over the capacitive characteristics of the device. The advanced capacitive behavior of our devices gives rise to a barrier for carrier injection at low frequencies. Conversely, it promotes the generation of a field-induced polarization current in the active layer at high frequencies. The alternative current driven organic light emitting device obtains the power efficiency over 300 lm/W A at \textgreater 500 cd/m2, which is the highest power efficiency to date among high-luminance organic light emitting devices, to the best of the authors' knowledge. We interpret these findings as the negative magnetoresistance induces the `secondary' carriers that would contribute to light.