High efficiency transparent organic light emitting devices
First Claim
1. A highly transparent and highly efficient organic light emitting device comprising, in sequence, an anode layer, a hole transporting layer, an electron transporting layer, and a cathode layer, wherein said cathode layer further comprises a metal-doped electron injection layer, and a transparent, non-metallic, electron injecting material in contact with said metal-doped electron injection layer, and wherein said metal-doped electron injection layer is a transparent material selected from the group consisting of a material which acts as a hole blocking layer, a material which acts as an exciton blocking material and a material which acts as a combination hole and exciton blocking material.
0 Assignments
0 Petitions
Accused Products
Abstract
A highly transparent non-metallic cathode is disclosed that comprises a metal-doped organic electron injection layer that is in direct contact with a transparent non-metallic electron injecting cathode layer, such as indium tin oxide (ITO), wherein the metal-doped organic electron injection layer also functions as an exciton blocking or hole blocking layer. The metal-doped organic electron injection layer is created by diffusing an ultra-thin layer of about 5-10 Å of a highly electropositive metal such as Li throughout the layer. A representative embodiment of the highly transparent non-metallic cathode comprises a layer of ITO, a layer of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), which acts as an electron injection, exciton blocking, and hole blocking layer, and an ultra-thin layer of lithium, which degenerately dopes the layer of BCP, improving the electron injecting properties of the BCP layer. This cathode is demonstrated for use in an OLED having a transparency of about 90% or higher combined with a device external quantum efficiency of about 1% or higher.
-
Citations
45 Claims
- 1. A highly transparent and highly efficient organic light emitting device comprising, in sequence, an anode layer, a hole transporting layer, an electron transporting layer, and a cathode layer, wherein said cathode layer further comprises a metal-doped electron injection layer, and a transparent, non-metallic, electron injecting material in contact with said metal-doped electron injection layer, and wherein said metal-doped electron injection layer is a transparent material selected from the group consisting of a material which acts as a hole blocking layer, a material which acts as an exciton blocking material and a material which acts as a combination hole and exciton blocking material.
-
26. A method for fabricating a highly transparent and highly efficient organic light emitting device comprising:
-
preparing, in sequence on a substrate, an anode, an organic hole transporting layer, an organic electron transporting layer, a transparent electron injection layer, and a transparent electron injecting layer, wherein said transparent electron injection layer is a material selected from the group consisting of a material which acts as a hole blocking layer, a material which acts as an exciton blocking material and a material which acts as a combination hole and exciton blocking material; and
wherein said preparing includes the step of doping said transparent electron injection layer with a metal to form a metal-doped transparent electron injection layer. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
-
- 39. A highly transparent and highly efficient cathode for use in an organic optoelectronic device comprising a transparent, non-metallic, electron injecting material in contact with a metal-doped electron injection layer, and wherein said metal-doped electron injection layer is a transparent material selected from the group consisting of a material which acts as a hole blocking layer, a material which acts as an exciton blocking material and a material which acts as a combination hole and exciton blocking material.
-
45. A highly transparent and highly efficient organic light emitting device comprising, in sequence,
an anode layer comprising ITO; -
a hole transporting layer comprising 4,4-bis[N-(1-naphthyl)-N-phenyl-amino] biphenyl;
an electron transporting layer comprising tris-(8-hydroxyquinoline) aluminum; and
a cathode, further comprising a lithium-doped electron injection layer comprising 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, and an ITO layer in contact with said lithium-doped electron injection layer.
-
Specification