Enhanced Electron Injection into Inverted Polymer Light‐Emitting Diodes by Combined Solution‐Processed Zinc Oxide/Polyethylenimine Interlayers

Abstract

Inverted device architectures for organic light-emitting diodes (OLEDs) require suitable interfaces or buffer layers to enhance electron injection from highwork-function transparent electrodes. A solution-processable combination of ZnO and PEI is reported, that facilitates electron injection and enables efficient and air-stable inverted devices. Replacing the metal anode by highly conductive polymers enables transparent OLEDs.