Process for fabricating an organic electronic device using liquid deposition and devices made by the process
View Patent ↗The present invention relates to a process for forming an organic electronic device having at least two organic layers. The process includes (a) applying a first organic layer having a first organic material by a method selected from vapor deposition and liquid deposition from a first organic liquid medium; (b) applying a second organic layer having a photoactive compound directly over at least a portion of the first organic layer by liquid deposition from a second organic liquid medium, wherein the first organic material is sparingly soluble in the second organic liquid medium.
1. A process for forming an organic electronic device comprising at least two organic layers, said process comprising
(a) applying a first organic layer comprising a first organic material that can be either active or inactive by a method selected from vapor deposition and liquid deposition from a first organic liquid medium;
(b) applying a second organic layer comprising an organometallic photoactive compound directly over at least a portion of the first organic layer by liquid deposition from a second organic liquid medium, wherein the first organic material is sparingly soluble in the second organic liquid medium, and the first organic liquid medium has solubility in the second organic liquid medium in the range of from 0.1 mg to 5.0 mg per mL.
2. The process of claim 1 , wherein the first organic material is a charge transport material.
3. The process of claim 2 , wherein the first organic material is a hole transport material.
4. The process of claim 1 , wherein the organometallic compound is a complex of at least one metal selected from Re, Ru, Os, Rh, Ir, Pd, Pt, and Au.
5. The process of claim 4 , wherein the metal is selected from Os, Ir, and Pt.
6. The process of claim 5 , wherein the at least one first ligand is selected from a phenyl-pyridine, phenyl-pyrimidine, phenyl-quinoline, bipyridine and thienyl-pyridine.
7. The process of claim 1 , wherein the organometallic compound is a complex having at least one first ligand selected from an aryl-N-heterocycle and a heteroaryl-N-heterocycle.
8. The process of claim 1 , wherein the second layer further comprises a diluent.
9. The process of claim 1 , wherein the second organic liquid medium comprises an organic liquid selected from fluorinated aromatic compounds, linear aliphatic ketones, branched aliphatic ketones, linear aliphatic esters, branched aliphatic esters, and mixtures thereof.
10. The process of claim 9 , wherein the metal is selected from Os, Ir, and Pt, and the organic liquid is selected from trifluorotoluene, ethyl acetate, 4-methyl-4-hydroxy-2-pentanone, and methylethylketone.
11. The process of claim 1 , wherein the first organic material is inactive.
12. The process of claim 1 , wherein the first organic layer is either patterned or unpatterned.
13. The process of claim 1 , wherein the second organic layer is either patterned or unpatterned.
14. The process of claim 13 , wherein the second organic layer is patterned.
15. The process of claim 1 , wherein liquid deposition is selected from the group of techniques consisting of spin coating, gravure coating, curtain coating, dip coating, slot-die coating, spray-coating, and continuous nozzle coating.