Performance of Three-Layered Organic Light-Emitting Diodes Using the Hole-Transport and Injection Layer of TPD and Teflon-AF, and the Electron-Injection Layer of Li2CO3 and LiF

The performance of three-layered organic light-emitting diodes (OLEDs) was investigated using TPD hole-transportand injection layers, Teflon-AF, and the electron-injection layer of Li2CO3 and LiF. The OLEDs were manufactured in astructure of TPD/Alq3/LiF, TPD/Alq3/Li2CO3, and AF/Alq3/LiF using low-molecular organic materials. In three differentthree-layered OLEDs, it was found that the device with the TPD/Alq3/LiF structure shows higher performance inmaximum luminance, and maximum external quantum efficiency compared to those of the device with TPD/Alq3/Li2CO3 and TPD/Alq3/LiF by 35% and 17%, and 193% and 133%, respectively. It is thought that the combined LiF/Al cathode contributes to a reduced work function and improves an electrical conduction mechanism due to theelectron injection rather than the hole transport, which then increases a recombination rate of charge carriers. KCI Citation Count: 0