Electrical Conduction of Organic Light-Emitting Diodes Using Self-Assembled Monolayer-Modified Indium Tin Oxide Electrode

Abstract

The introduction of fluorinated self-assembled monolayer (FSAM) as a hole-injection layer increased the work function of ITO and decreased the driving voltage of Alq3-based organic light-emitting diodes (OLED). We discussed carrier transport of Alq3-based OLED with or without FSAM and LiF as an electron-injection layer. The current amount depends on hole injection and the emission depends on electron injection. We proposed the method comparing between two ratios of current density and luminance and clarified the leakage of hole current through Alq3 layer with low hole mobility in the low voltage region.