Patent ID: 6429451
Filing Date: 2002-08-06
Classification: H01L

Abstract:
An organic light-emitting device having reduced ambient-light reflection from a cathode, comprising:a) a light-transmissive substrate; b) a light-transmissive anode disposed over the substrate; c) an organic hole-transporting layer disposed over the anode; d) an organic electron-transporting layer disposed over the hole-transporting layer, an interface between the electron-transporting layer and the hole-transporting layer forming a junction capable of emitting light when the device is operative; e) a bi-layer interfacial structure disposed over the electron-transporting layer, the bi-layer interfacial structure capable of providing electron injection into the electron-transporting layer; f) a reflection-reducing layer disposed over the bi-layer interfacial structure, the reflection-reducing layer formed of an n-type semiconductor material having a work function greater than 4.0 eV, the reflection-reducing layer substantially reducing reflection of ambient-light entering the device through the substrate and the anode; and g) a cathode disposed over the reflection-reducing layer, the cathode formed of a light-reflecting metal material.