Reduction of ambient-light-reflection in organic light-emitting devices
AssigneeEastman Kodak Company
InventorsLiang-Sun Hung, Joseph K. Madathil
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Abstract
An organic light-emitting device capable of reducing ambient-light reflection from a cathode includes a light-transmissive substrate, a light-transmissive anode, an organic hole-transporting layer, and an organic electron transporting layer. A reflection-reducing structure disposed between the electron-transporting layer and a light-reflective cathode is capable of providing electron injection into the electron-transporting layer and of substantially reducing reflection of ambient-light entering the device.
Claims8
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.
Dependencies are inferred from the claim text.