Process for forming an organic light-emitting diode and devices made by the process
View Patent ↗There is provided a new process for forming a light-emitting diode device having first, second, and third subpixel areas. In the process a hole injection layer is applied over an anode layer. The hole injection material has a conductive polymer and a fluorinated acid polymer. A hole transport layer is applied over the hole injection layer. A first electroluminescent material which is either green or blue, is applied to the first subpixel areas. A second electroluminescent material which is either blue or green, is applied to the second subpixel areas. A red electroluminescent material is applied overall, followed by deposition of a cathode. The second electroluminescent material emits a color different from that of the first electroluminescent material.
1. A process for forming a multicolor organic light-emitting diode having first and second subpixel areas, said process comprising:
applying a hole injection layer over an anode layer, said hole injection
layer comprising a conductive polymer and a fluorinated acid polymer; applying a hole transport layer over the hole injection layer;
applying a first electroluminescent material only to the first subpixel areas;
applying a red electroluminescent material over said first and second subpixel areas;
applying a cathode;
wherein the first electroluminescent material is selected from a green electroluminescent material and a blue electroluminescent material.
2. The process of claim 1 , wherein the first electroluminescent material is applied by liquid deposition from a first liquid composition and the red electroluminescent material is applied by vapor deposition.
3. The process of claim 1 , wherein the conductive polymer is selected from the group consisting of polythiophenes, polyselenophenes, poly(tellurophenes), polypyrroles, polyanilines, and polycyclic aromatics, and copolymers thereof.
4. The process of claim 1 , wherein the first electroluminescent material and/or the red electroluminescent material is present with a host material.
5. The process of claim 1 , wherein the fluorinated acid polymer has one or more backbones selected from the group consisting of polyolefins, polyacrylates, polymethacrylates, polyimides, polyamides, polyaramids, polyacrylamides, polystyrenes, and combinations thereof.
6. A process for forming a multicolor organic light-emitting diode having first, second and third subpixel areas, said process comprising:
applying a hole injection layer over an anode layer, said hole injection layer comprising a conductive polymer and a fluorinated acid polymer;
applying a hole transport layer over the hole injection layer;
applying a first electroluminescent material only to the first subpixel areas;
applying a second electroluminescent material only to the second subpixel areas;
applying a red electroluminescent material over said first, second, and third subpixel areas;
applying a cathode;
wherein the first and second electroluminescent materials are selected from the group consisting of green electroluminescent materials and blue electroluminescent materials;
with the proviso that the second electroluminescent material emits a color different from that of the first electroluminescent material.
7. The process of claim 6 , wherein the first electroluminescent material is applied by liquid deposition from a first liquid composition, the second electroluminescent material is applied by liquid deposition from a second liquid composition, and the red electroluminescent material is applied by vapor deposition.
8. A multicolor organic light-emitting diode device having first and second subpixel areas, said device comprising:
an anode;
a hole injection layer comprising a conductive polymer and a fluorinated acid polymer;
a hole transport layer;
a first electroluminescent layer only in the first subpixel areas;
a red electroluminescent layer over said first and second subpixel areas; and
a cathode;
wherein the first electroluminescent comprises a material selected from the group consisting of green electroluminescent materials and blue electroluminescent materials.
9. A multicolor organic light-emitting diode, device having first, second, and third subpixel areas, said device comprising:
an anode;
a hole injection layer comprising a conductive polymer and a fluorinated acid polymer;
a hole transport layer;
a first electroluminescent layer only in the first subpixel areas;
a second electroluminescent layer only in the second subpixel areas;
a red electroluminescent layer over said first, second, and third subpixel areas; and
a cathode;
wherein the first and second electroluminescent are different and each comprises a material selected from the group consisting of green electroluminescent materials and blue electroluminescent materials.
10. The process of claim 1 , wherein the red electroluminescent material is applied by blanket deposition.
11. The process of claim 6 , wherein the red electroluminescent material is applied by blanket deposition.
12. The process of claim 1 , wherein the red electroluminescent material is applied by a continuous liquid deposition technique from a liquid composition.
13. The process of claim 6 , wherein the red electroluminescent material is applied by a continuous liquid deposition technique from a liquid composition.
14. The process of claim 8 , wherein the red electroluminescent layer is applied by a continuous liquid deposition technique from a liquid composition.
15. The process of claim 9 , wherein the red electroluminescent layer is applied by a continuous liquid deposition technique from a liquid composition.