Improvement in the Lifetime, and Light Extraction Efficiency of Organic Light Emitting Diodes by Using High Conductive, Low Index Transparent Polymer Anodes
Bao Dong To1*, Jeng-Rong Ho2, Hung-Chih Kan1, Chia Chen Hsu1
1Department of Physics, National Chung Cheng University, Chia-yi, Taiwan
2Department of Mechanical Engineering, National Central University, Taoyuan, Taiwan
* presenting author:Bao Dong To,
We present a simple method to improve the lifetime, and light extraction efficiency of organic light emitting diodes (OLED) by using a highly conductive poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) thin film to replace ITO as the transparent electrode of OLED. The conductivity of PEDOT:PSS significant increase due to the doping ethylene glycol (EG) or using H2SO4 treatment. The lifetime and light emitting performance of the ITO-OLED and PEDOT:PSS - OLED were investigated. The results show that the lifetime of PEDOT:PSS - OLED is longer than that of the ITO-OLED, and the improvement of luminance efficiency of H2SO4 treated PEDOT:PSS - OLED reaches up to 35% compared with that of the ITO-OLED.

Keywords: PEDOT:PSS electrode, light out coupling, OLED, high conductive polymer, lifetime