White organic electroluminescent device
View Patent ↗What is disclosed is an organic electroluminescent device which produces a white output spectrum. A plurality of emissive layers, each emitting in a particular spectrum, are fabricated together in one device by cross-linking at least some the layers. One of the emissive layers has both an emissive and a non-emissive function.
1. An organic electroluminescent device, comprising:
a first emissive layer comprising a non-emissive component and a first emissive component, wherein at least one of said first emissive component and said non-emissive component includes at least one of a polymer, polymer blend, and co-polymer, and wherein the other one of said first emissive component and said non-emissive component includes at least one of a polymer, polymer blend, monomer, oligomer, co-polymer, and an organic side-group, and wherein the first emissive layer is cross-linked, said first emissive component capable of emitting light in a first spectrum;
a second emissive layer disposed over said first emissive layer, said second emissive layer comprising at least one additional emissive component, wherein said at least one additional emissive component includes at least one of a polymer, polymer blend, co-polymer, or at least one of a polymer, polymer blend, co-polymer in combination with at least one of a monomer, oligomer, and an organic side-group, said first emissive layer is insoluble to the material used in fabricating said second emissive layer, wherein said second emissive layer is capable of emitting light in a second spectrum, further wherein said first spectrum and second spectrum combine such that an output spectrum of said device is white.
2. A device according to claim 1 further comprising a substrate; and an anode disposed over said substrate.
3. A device according to claim 2 further comprising a hole transporting layer, said hole transporting layer disposed between said anode and said first emissive layer.
4. A device according to claim 3 further comprising a cathode disposed over said second emissive layer.
5. A device according to claim 1 wherein at least one of said first and second emissive layers comprises a conjugated polymer layer.
6. A device according to claim 1 wherein said first spectrum is green.
7. A device according to claim 6 wherein said second spectrum includes blue and at least one of red, orange and yellow.
8. A device according to claim 1 wherein said first spectrum is at least one of red, orange and yellow.
9. A device according to claim 8 wherein said second spectrum includes at least one of blue and green.
10. A device according to claim 1 wherein said first emissive component is a green-emitting polymer and said non-emissive component is a cross-linkable hole transporting polymer, said first emissive component blended together with said non-emissive component.
11. A device according to claim 10 wherein said at least one additional emissive component includes a blue-emitting polymer blended with a red-emitting polymer.
12. A device according to claim 11 wherein the concentration of red-emitting polymer to blue-emitting polymer is approximately 0.1 percent by weight.
13. A device according to claim 12 wherein the concentration of green-emitting polymer to hole-transporting polymer is chosen from the range of approximately 1 percent by weight to approximately 50% by weight.
14. A device according to claim 1 wherein said first spectrum is blue.
15. A device according to claim 14 wherein said second spectrum includes green and at least one of red, orange and yellow.
16. A device according to claim 1 wherein said second spectrum is blue.
17. A device according to claim 16 wherein said first spectrum includes green and at least one of red, orange and yellow.
18. An organic electroluminescent device, comprising:
a first emissive layer comprising a non-emissive component and a first emissive component, wherein at least one of said first emissive component and said non-emissive component includes at least one of a polymer, polymer blend, and co-polymer, and wherein the other one of said first emissive component and said non-emissive component includes at least one of a polymer, polymer blend, monomer, oligomer, co-polymer, and an organic side-group, and wherein the first emissive layer is cross-linked, said first emissive component capable of emitting light in a first spectrum;
a second emissive layer disposed over said first emissive layer, said second emissive layer comprising at least one secondary emissive component, wherein said at least one secondary emissive component includes at least one of a polymer, polymer blend, co-polymer, or at least one of a polymer, polymer blend, co-polymer in combination with at least one of a monomer, oligomer, and an organic side-group, and wherein the second emissive layer is cross-linked, said first emissive layer is insoluble to the material used in fabricating said second emissive layer, wherein said second emissive layer is capable of emitting light in a second spectrum; and
a third emissive layer disposed over said second emissive layer, said third emissive layer comprising at least one tertiary emissive component, wherein said at least one tertiary emissive component includes at least one of a polymer, polymer blend, co-polymer, or at least one of a polymer, polymer blend, co-polymer in combination with at least one of a monomer, oligomer, and an organic side-group, said second emissive layer is insoluble to the material used in fabricating said third emissive layer, wherein said third emissive layer is capable of emitting light in a third spectrum, further wherein said first spectrum, second spectrum and third spectrum combine such that an output spectrum of said device is white.
19. A device according to claim 18 further comprising a substrate; and an anode disposed over said substrate.
20. A device according to claim 19 further comprising a hole transporting layer, said hole transporting layer disposed between said anode and said first emissive layer.
21. A device according to claim 20 further comprising a cathode disposed over said third emissive layer.
22. A device according to claim 18 wherein at least one of said first and second emissive layers comprises a conjugated polymer layer.
23. A device according to claim 18 wherein said first spectrum is green.
24. A device according to claim 23 wherein said second spectrum includes blue and said third spectrum includes at least one of red, orange and yellow.
25. A device according to claim 23 wherein said third spectrum includes blue and said second spectrum includes at least one of red, orange and yellow.
26. A device according to claim 18 wherein said first spectrum is at least one of red, orange and yellow.
27. A device according to claim 26 wherein said second spectrum includes blue and said third spectrum includes green.
28. A device according to claim 26 wherein said third spectrum includes blue and said second spectrum includes green.
29. A device according to claim 18 wherein said first emissive component is a green-emitting polymer and said non-emissive component is a cross-linkable hole transporting polymer, said first emissive component blended together with said non-emissive component.
30. A device according to claim 29 wherein said secondary emissive component includes a blue-emitting polymer and said tertiary emissive component includes a red-emitting polymer.
31. A device according to claim 18 wherein said first spectrum is blue.
32. A device according to claim 31 wherein said second spectrum includes green and said third spectrum includes at least one of red, orange and yellow.
33. A device according to claim 31 wherein said third spectrum includes green and said second spectrum includes at least one of red, orange and yellow.
34. An organic electroluminescent device, comprising:
a first emissive layer comprising a non-emissive component and a first emissive component, wherein at least one of said first emissive component and said non-emissive component includes at least one of a polymer, polymer blend, and co-polymer, and wherein the other one of said first emissive component and said non-emissive component includes at least one of a polymer, polymer blend, monomer, oligomer, co-polymer, and an organic side-group, and wherein the first emissive layer is cross-linked, said first emissive component capable of emitting light in a first spectrum;
a second emissive layer disposed over said first emissive layer, said second emissive layer comprising at least one additional emissive component, wherein said at least one additional emissive component includes at least one of a polymer, polymer blend, co-polymer, or at least one of a polymer, polymer blend, co-polymer in combination with at least one of a monomer, oligomer, and an organic side-group, said first emissive layer is insoluble to the material used in fabricating said second emissive layer, wherein said second emissive layer is capable of emitting light in a second spectrum, further wherein said first spectrum and second spectrum combine to generate an output spectrum of said device.
35. An organic electroluminescent device, comprising:
a first emissive layer comprising a non-emissive component and a first emissive component, wherein at least one of said first emissive component and said non-emissive component includes at least one of a polymer, polymer blend, and co-polymer, and wherein the other one of said first emissive component and said non-emissive component includes at least one of a polymer, polymer blend, monomer, oligomer, co-polymer, and an organic side-group, and wherein the first emissive layer is cross-linked, said first emissive component capable of emitting light in a first spectrum;
a second emissive layer disposed over said first emissive layer, said second emissive layer comprising at least one secondary emissive component, wherein said at least one secondary emissive component includes at least one of a polymer, polymer blend, co-polymer, or at least one of a polymer, polymer blend, co-polymer in combination with at least one of a monomer, oligomer, and an organic side-group, wherein said second emissive layer is cross-linked, said first emissive layer is insoluble to the material used in fabricating said second emissive layer, wherein said second emissive layer is capable of emitting light in a second spectrum; and
a third emissive layer disposed over said second emissive layer, said third emissive layer comprising at least one tertiary emissive component, wherein said at least one tertiary emissive component includes at least one of a polymer, polymer blend, co-polymer, or at least one of a polymer, polymer blend, co-polymer in combination with at least one of a monomer, oligomer, and an organic side-group, said second emissive layer is insoluble to the material used in fabricating said third emissive layer, wherein said third emissive layer is capable of emitting light in a third spectrum, further wherein said first spectrum, second spectrum and third spectrum combine to generate an output spectrum of said device.