Organic electronic device with hole injection
View Patent ↗In a first embodiment of the present invention, in order to increase the number of holes injected into the emissive layer, an intermixed layer is formed from the intermixing of the hole transport layer (“HTL”) and the emissive layer. The intermixed layer is between the HTL and the emissive layer of the OLED device. Alternatively, in a second embodiment of the present invention, in order to increase the number of holes injected into the emissive layer, a separate interlayer is incorporated within the OLED device. The interlayer is comprised of a hole transport material in which one of its components is at least partially replaced with one of the components of the emissive layer that is responsible for hole injection and transport. The separate interlayer is between the anode and the emissive layer of the OLED device. One or more intermediate layers may be present between the interlayer and the anode such as, for example, a HTL may be present between those two layers.
1. An OLED device, comprising:
a substrate;
an anode on said substrate;
an interlayer on said anode;
an emissive layer on said interlayer, wherein said emissive layer includes a plurality of first components that are responsible for hole injection and transport; and
a cathode on said emissive layer,
wherein said interlayer includes a hole transport material having a plurality of second components and a plurality of third components,
wherein a particular one of said plurality of second components is the same said plurality of first components that are responsible for hole injection and transport in the emissive layer,
wherein said plurality of second components of the interlayer are polymerized with a particular one of said plurality of third components,
wherein said interlayer has a range of IPs between a highest IP of an adjacent layer on an anode-end and a lowest IP of an adjacent layer on an “emissive layer”-end, and
wherein said interlayer is formed directly on said anode.
2. The OLED device of claim 1 , wherein said plurality of first components that are responsible for hole injection and transport are amines.
3. The OLED device of claim 2 , wherein said amines are triarylamines.
4. The OLED device of claim 1 , wherein said plurality of third components are responsible for hole injection and transport, wherein the OLED device further comprises a main chain which includes an aliphatic group between said particular one of said plurality of second components and said particular one of said plurality of third components, and wherein said aliphatic group facilitates synthesis of said interlayer.
5. The OLED device of claim 1 , wherein said interlayer is free of an electroluminescent material.
6. An OLED device, comprising:
a substrate;
an anode on said substrate;
an interlayer on said anode;
an emissive layer on said interlayer, wherein said emissive layer includes a plurality of first components that are responsible for hole injection and transport; and
a cathode on said emissive layer,
wherein said interlayer includes a hole transport material having a plurality of second components and a plurality of third components,
wherein a particular one of said plurality of second components is the same as said plurality of first components that are responsible for hole injection and transport in the emissive layer,
wherein said plurality of second components of the interlayer are polymerized with a particular one of said plurality of third components,
wherein said interlayer has a range of IPs between a highest IP of an adjacent layer on an anode-end and a lowest IP of an adjacent layer on an “emissive layer”-end, and
wherein said interlayer is free of an electroluminescent material.
7. The OLED device of claim 6 , further comprising a hole transport layer between said anode and said interlayer.
8. The OLED device of claim 6 , wherein said plurality of first components that are responsible for hole injection and transport are amines.
9. The OLED device of claim 8 , wherein said amines are triarylamines.
10. The OLED device of claim 6 , wherein said plurality of third components are responsible for hole injection and transport, wherein the OLED device further comprises a main chain which includes an aliphatic group between said particular one of said plurality of second components and said particular one of said plurality of third components, and wherein said aliphatic group facilitates synthesis of said interlayer.
11. The OLED device of claim 6 , wherein said interlayer is formed directly on said anode.