Synthesis and Fabrication of Fluorescent Green OLEDs Based on PEDOT:PSS/Silver Nanowire Hybrid-Composite Anode and Their Performance

Abstract

Transparent conducting films have attracted increasing attention for their usefulness in optoelectronic devices, such as solar cells, liquid crystal display, and LEDs. Silver nanowires (AgNWs) with a length of 20 μm and a diameter of 70 nm was synthesized using polyol process. The optimized concentration of AgNWs is 0.5 mg of Ag NWs in 1 ml of PEDOT:PSS and it was used to fabricate PEDOT:PSS/AgNWs hybrid-composite TCF electrode, resulting in 88% transmittance and good electrical conductive (30 Ω sq−1) thin film. Two types of green fluorescent OLEDs were fabricated: those made with conventional ITO anode and the anode based on PEDOT:PSS/Ag NWs hybrid-composite. The observed maximum luminous intensity was increased by 27% in OLED fabricated PEDOT:PSS/AgNWs hybrid-composite TCF electrode, compared to the conventional ITO. At a wavelength of 530 nm, the maximum luminous intensities for green fluorescent OLEDs fabricated on PEDOT:PSS/AgNWs hybrid-composite TCF and ITO anode were 1610 counts per second and 1260 counts per second, respectively. The observed maximum current density increased by 28% as compared to the conventional ITO. The observed current densities were 370 mA cm−2 for OLEDs fabricated on PEDOT:PSS/AgNWs hybrid-composite TCF-based anode, and 293 mA cm−2 for conventional ITO anode. The proposed hybrid-composite electrode is a suitable material to replace conventional ITO.