Organic light-emitting diodes (OLEDs) is the display device that emits the light from the organic emitting layer. in the device. So by using the OLEDs, we can make the display thinner with higher contrast ratio, faster response time, and wider viewing angle and can be applied as flexible and transparent display device. Due to these advantages of OLEDS, considerable attentions and efforts are paid from numerous companies and researchers. However, the light from the emission layer are extracted only 20% because the light loss is derived from the surface plasmon polariton mode and wave-guide mode. A lot of efforts are paid to enhance the light extraction efficiency such as patterning the electrodes or optimizing the structure of the device, but the performance are still behind from inorganic LED.
As the demand of watches, fabric of apparel, and glasses has been increased, organic photovoltaics (OPV) has received dramatic attention because of the favorable characteristics such as low cost, ease of manufacture, and low weight. To date, there has been numerous attempts to improve the efficiency of OPVs through the development of transparent conductive electrodes (TCEs), optimal device structures, interface engineering methods, electron transport layers (ETL) and hole transport layers (HTL) to facilitate work function (WF) matching of electrodes. However, the power conversion efficiency (PCE) of flexible OPVs is much lower than that of rigid OPVs because of a lack of flexible transparent electrodes with good conductivities.
To solve these problems, we research highly flexible oxide-based multilayer TCEs that has superior optical and electrical characteristic and apply them as OLED and OPV electrodes to optimize trade-off relationship between optical transmittance and sheet resistance and enhance the light extraction efficiency. The optical simulation tool is used to analyze the optical characteristics (cavity effect, far-field intensity, plasmonic effect, cavity effect vs. transmittance of electrode) of the device thus we can research and demonstrate the electrode structures or each layers of the device.