Organic light-emitting device with improved layer structure
AssigneeAu Optronics Corporation
InventorShi-Hao Li
Life of this patent
Estimating the term…
Abstract
An organic light emitting device having a cathode, an anode and an organic layer structure disposed between the cathode and the anode, the organic layer structure comprising a hole injection layer doped with a p-type dopant, a hole transport layer, an emissive layer and an electron transport layer doped with an n-type dopant, wherein all of the layers in the organic layer structure are substantially made from the same organic host material. In particular, the organic host material is a bipolar organic material such as a derivative of fused aromatic rings. The emissive layer can be doped with a fluorescent dye or a phosphorescent dye.
Claims5
An organic light emitting device comprising:
- a cathode;
- an anode;
- and
- an organic layer structure disposed between the cathode and the anode, the organic layer comprising:
- a hole transport layer disposed adjacent to the anode;
- an electron transport layer disposed adjacent to the cathode;
- and
- an emissive layer disposed between the hole transport layer and the electron transport layer, wherein the hole transport layer, the emissive layer and the electron transport layer are made from substantially the same organic host material, wherein the organic host material comprises a derivative of fused rings, and wherein all fused rings in the organic host material are benzene-based aromatic rings, wherein the organic layer structure further comprises a hole injection layer disposed between the hole transport layer and the anode and wherein the hole injection layer is made substantially from the same organic host material doped with at least one p-type dopant.
Dependencies are inferred from the claim text.