Solution-Processed Carrier Injection Layer for Microfluidic Organic Light-Emitting Diodes

Abstract

We investigated an effect of a solution-processed electron injection layer (EIL) on an electroluminescent (EL) performance of organic light-emitting diode with a liquid emitting layer (Liquid OLED). A pyrene-based liquid organic semiconductor, 1-pyrenebutyric acid 2-ethylhexyl ester (PLQ), was used as a greenish-blue emitter. Zinc oxide nanoparticles (ZnO NPs) were deposited on an indium tin oxide (ITO) cathode by a spin-coating method. We fabricated two kinds of liquid OLEDs with ITO anode/PLQ/ITO cathode and ITO anode/PLQ/ZnO NPs (EIL)/ITO cathode. Current density and luminance were increased significantly by inserting the ZnO NPs between the ITO cathode and PLQ. We expect that the solution-processed ZnO NPs can be useful in developing microfluidic OLED displays.