Realization of Organic EL Devices without ITO Transparent Electrodes

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In order to realize organic light emitting devices without transparent ITO electrodes, experimental and theoretical studies were performed. Metal-Insulator-Metal (MIM) structures having an organic light emitting layer at the center of the structures were prepared and their emission properties were measured. An intensity enhancement of ~25 was observed in good agreement with theoretical estimates. The intensity enhancement can be well explained in terms of light emission mediated by symmetric surface plasmon polaritons in the MIM structure. Results of simulations for realistic light emitting devices indicate that the light-extraction efficiency is greatly enhanced when an ITO electrode is replaced by an Ag electrode. The present results suggest that organic light emitting devices with high efficiencies can be constructed without ITO electrodes.