Green top-emitting organic light emitting device with transparent Ba∕Ag bilayer cathode

Abstract

Using a vacuum thermal technique, semitransparent Ba∕Ag bilayer cathode has been fabricated for the top-emitting organic light emitting devices. In this work, optical transparency over 60% in the visible region and low sheet resistance of about 15Ω∕sq in the Ba (10nm)∕Ag (8nm) structure are reported. The surface and compositional morphologies of the cathode play a crucial role in determining the optical properties. Top-emitting organic light emitting device using this cathode has been fabricated and studied.