Polymer and small molecule based hybrid light source
An organic electroluminescent device, includes: a substrate; a hole-injecting electrode (anode) coated over the substrate; a hole injection layer coated over the anode; a hole transporting layer coated over the hole injection layer; a polymer based light emitting layer, coated over the hole transporting layer; a small molecule based light emitting layer, thermally evaporated over the polymer based light emitting layer; and an electron-injecting electrode (cathode) deposited over the electroluminescent polymer layer.
1. An organic electroluminescent device comprising:
a substrate;
a hole-injecting electrode disposed over the substrate;
a hole injecting anode buffer layer coated over the hole-injecting electrode;
a hole transporting interlayer coated over the anode buffer layer, wherein the hole transporting interlayer includes a conductivity dopant;
a polymer-based light emissive layer coated over the hole transporting interlayer, wherein the polymer-based emissive layer contains a first material and a second material, the first material being a luminescent polymer and the second material being a molecule capable of charge transport, wherein the luminescent polymer is different from the molecule capable of charge transport;
a small molecule-based light emissive layer disposed over the polymer-based light ernissive layer; and
an electron-injecting electrode disposed over the small molecule-based light emissive layer.
2. The device according to claim 1 wherein said small molecule based light emissive layer is replaced by a hole blocking layer doped with at least one emissive dopant.
3. The device according to claim 1 wherein said hole transporting interlayer comprises a copolymer of the hole transporting polymer and a blended organic derivative.
4. The device according to claim 1 wherein said hole transporting interlayer comprises at least one of a conjugated polythiophene polymer derivative, phenylvinylene polymer or fluorine, polyspiro, or co-polymer.
5. The device according to claim 1 wherein said hole transporting interlayer comprises a crosslinked polymer or a blend of polymers, at least one of which is crosslinked.
6. The device according to claim 1 , wherein the polymer-based light emissive layer comprises at least one of a non-conjugated polymer, conjugated PPV, conjugated fluorene, conjugated poly-spiro or co-polymer.
7. The device according to claim 1 wherein the polymer-based light emissive layer comprises a blend of polymers with organic derivatives.
8. The device according to claim 1 wherein the polymer-based light emissive layer is doped with organic derivative compounds.
9. The device according to claim 1 wherein the polymer-based light emissive layer contains phosphorescent dopants.
10. The device according to claim 1 wherein the polymer-based light emissive layer comprises phosphorescence based materials.
11. The device according to claim 1 wherein the polymer-based light emissive layer is replaced by triplet emitters that are solution processible materials.
12. The device according to claim 1 wherein said small molecule-based light emissive layer comprises fluorescence based materials.
13. The device according to claim 1 wherein said small molecule-based light emissive layer is doped with organic derivatives.
14. The device according to claim 1 wherein said small molecule-based light emissive layer comprises phosphorescence based dopants.
15. The device according to claim 1 wherein said small molecule-based light emissive layer comprises phosphorescence based materials.
16. The device according to claim 1 wherein said small molecule-based light emissive layer is replaced by triplet emitters that can be thermally evaporated.
17. The device according to claim 1 wherein said small molecule-based light emissive layer is fabricated by at least one of: vacuum deposition, thermal evaporation or sputtering.
18. The device according to claim 1 wherein the polymer-based light emissive layer contains small molecular transport moieties.
19. The device according to claim 6 , wherein the at least one non-conjugated polymer is selected from polystyrene, poly-vinyl carbazole, poly-vinyl acene, aromatic polyesters, polyimide and poly-benzo-siloles.
20. The device according to claim 1 , wherein the charge transporting material includes polythiophene, derivatized polythiophene, oligomeric polythiophene, derivatized oligomeric polythiophene, pentacene, triphenylamine, or triphenyldiamine.
21. The device according to claim 1 , wherein the conductivity dopants include one or more of ferric chloride, ferric bromide, antimony pentachioride, arsenic pentachioride or boron trifluoride.
22. The device according to claim 1 , wherein the conductivity dopants include one or more of 2,3,5,6-tetrafluoro-7,7,8,8-tetracyano-quinodimethane, dicyanodichloroquinone or trinitrofluorenone.
23. The device according to claim 1 wherein said small molecule based light emissive layer is a hole blocking layer doped with at least one emissive dopant.
24. The device according to claim 1 wherein the polymer-based light emissive layer comprises triplet emmiters that are solution processible materials.
25. The device according to claim 1 wherein the molecule capable of charge transport is a small molecule.
26. The device according to claim 1 wherein the molecule capable of charge transport is a polymer.