Actual Emitting Region in Organic Electroluminescent Diodes with Multilayer Structure

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Abstract
The EL mechanism of organic light-emitting diodes (organic LEDs) with a multilayer structure was studied by the dye-doping method. The actual emitting region of the specimen was found to be in some, not all, of the emission layers near the cathode. It shifted from the emission layer beside the cathode to one beside the anode depending on applied current, and it extended over several emission layers with the increase of current. In addition, the EL efficiency per current density in the specimen was 1/10 lower than that in the double-layer specimen. We discussed the possibility of the effect of exciton confinement.