ABSTRACT
The luminescent properties of organic light-emitting devices have improved with the combination of a nano-sized multi-cathode structure and the external micro-cavity effect. From the detailed optical analysis, it was found that Surface Plasmon (SP) loss in a metal cathode is suppressed to less than 10% due to the combination of long-range and short-range SP. Not less than 90% of optical power in dipole emission can be successfully utilized as propagation light. In addition, it will be shown that the external micro-cavity effect coupled with SP resonance is useful for the improvement of the color purity of the emission. In results, the color gamut in Organic Light-Emitting Devices (OLEDs) approaches the BT.2020 national standard and an external quantum efficiency was improved by a factor of more than 1.5. The effect of the external micro-cavity will be discussed from a viewpoint of multi-scale optical analysis.
