Method of making organic light emitting devices
View Patent ↗The present invention provides a method for the preparation of organic light-emitting devices comprising a bilayer structure made by forming a first film layer comprising an electroactive material and an INP precursor material, and exposing the first film layer to a radiation source under an inert atmosphere to generate an interpenetrating network polymer composition comprising the electroactive material. At least one additional layer is disposed on the reacted first film layer to complete the bilayer structure. The bilayer structure is comprised within an organic light-emitting device comprising standard features such as electrodes and optionally one or more additional layers serving as a bipolar emission layer, a hole injection layer, an electron injection layer, an electron transport layer, a hole transport layer, exciton-hole transporting layer, exciton-electron transporting layer, a hole transporting emission layer, or an electron transporting emission layer.
1. A method of making an organic light-emitting device comprising at least one bilayer structure, said method comprising:
providing a first layer comprising an electroactive material, and an INP precursor material;
exposing the first layer while in contact with an inert atmosphere to a radiation source to afford a reacted first layer comprising an interpenetrating network polymer composition; and
disposing at least one second layer on the reacted first layer to afford a bilayer structure.
2. The method according to claim 1 , wherein said reacted first layer is a bipolar emission layer, a hole injection layer, an electron injection layer, an electron transport layer, a hole transport layer, exciton-hole transporting layer, exciton-electron transporting layer, a hole transporting emission layer, or an electron transporting emission layer.
3. The method according to claim 1 , wherein said reacted first layer comprises an electroluminescent polymer.
4. The method according to claim 1 , wherein said electroactive material is selected from the group consisting of poly(N-vinylcarbazole), polyfluorenes, poly(para-phenylenes), poly(p-phenylene vinylenes), poly(pyridine vinylenes), polyquinoxalines, polyquinolines, polysilanes, copolymers thereof, and combinations thereof.
5. The method according to claim 1 , wherein said INP precursor material comprises a poly-acrylated compound, a poly-methacryalted compound, a poly-epoxide compound, a vinyl aromatic compound, a poly-carbamoylated compound, a polyvinyl ether compound, a trialkoxysilane, an organic orthosilicate, or a combination of two or more of the foregoing.
6. The method according to claim 1 , wherein said INP precursor material comprises an acrylated INP precursor material.
7. The method according to claim 1 , wherein said INP precursor material comprises a tri-acrylated compound having structure I
8. The method according to claim 1 , wherein the first layer comprises the electroactive material in an amount corresponding to from about 0.1 to about 50 percent by weight based on a total weight of the first layer.
9. The method according to claim 1 , wherein the first layer comprises the electroactive material in an amount corresponding to from about 5 to about 45 percent by weight based on a total weight of the first layer.
10. The method according to claim 1 , wherein the first layer comprises the INP precursor material in an amount corresponding to from about 99.9 to about 10 percent by weight based on a total weight of the first layer.
11. The method according to claim 1 , wherein said second layer is a bipolar emission layer, a hole injection layer, an electron injection layer, an electron transport layer, a hole transport layer, exciton-hole transporting layer, exciton-electron transporting layer, a hole transporting emission layer, or an electron transporting emission layer.
12. The method according to claim 1 , wherein said reacted first layer comprises a polymeric organic iridium complex.
13. The method according to claim 1 , wherein said radiation source is selected from the group consisting of visible light sources, ultra-violet light sources, gamma radiation sources, electron-beam sources, and combinations thereof.
14. The method according to claim 1 , wherein said disposing of the second layer comprises solvent-casting, spin-coating, dip coating, spray coating, blade coating, or a combination thereof.
15. A bilayer structure prepared according to the method of claim 1 .
16. An organic light-emitting device prepared according to the method of claim 1 .
17. A method of making an organic light-emitting device comprising at least one bilayer structure, said method comprising:
providing a first layer comprising an electroluminescent polymer, and an INP precursor material;
exposing the first layer while in contact with an inert atmosphere to a radiation source to afford a reacted first layer comprising an interpenetrating network polymer composition; and
disposing at least one second layer on the reacted first layer to afford a bilayer structure.
18. A method of making an organic light-emitting device comprising at least one bilayer structure, said method comprising:
disposing a first layer comprising an electroactive material, and an INP precursor material onto a substrate comprising a first electrode;
exposing the first layer while in contact with an inert atmosphere to a radiation source to afford an a reacted first layer comprising an interpenetrating network polymer composition; and
disposing at least one second layer on the reacted first layer to afford a bilayer structure; and
disposing a second electrode on an assembly comprising the bilayer structure.
19. The method according to claim 16 , wherein said first electrode comprises indium tin oxide.
20. The method according to claim 16 , wherein said electroactive material is an electroluminescent polymer.
21. The method according to claim 16 , wherein said INP precursor material comprises a poly-acrylated compound.
22. An organic light-emitting device prepared according to the method of claim 17 .