Solution for organic EL, method of producing organic EL device and organic EL device

1. An organic EL ink suitable for a printing apparatus, comprising:

a mixed solvent of two or more kinds of organic solvents which contain at least a first organic solvent and a second organic solvent; and

an organic EL contributing material dissolved into the mixed solvent,

wherein the first organic solvent comprises benzyl butyrate, wherein HSP coordinates of the second organic solvent are Hd in a range of 17.5 to 19.5 (J/cm3) 1/2 , Hp in a range of 0 to 2.0 (J/cm3) 1/2 , and Hh in a range of 0.5 to 2.5 (J/cm3) 1/2 , and

wherein the second organic solvent comprises mesitylene, cyclohexylbenzene, toluene, benzene, p-diethylbenzene, ethylbenzene, o-n-butyltoluene, 1,2-diethylbenzene, 1,2,3,4-tetramethylbenzene, 1,2,3,5-tetramethylbenzene, 1,1-diphenylpentane, 1,1-diphenylhexane, 3-(1-methylethenyl)toluene, 1-methyl-3-propylbenzene, 1-methyl-4-methylethyl)-2-(1-propenyl)benzene, pentamethylbenzene, isopropylbenzene, 1,2,4-trimethylbenzene, 2,2-diphenylpropane, 2-ethyldiphenylmethane, 1,4-dimethyltetraline, calamenene, 1-butyl-1,2,3,4-tetrahydronaphthalene, 3-ethyldiphenylmethane, 1,1-diphenylpropane, 3-ethylbiphenyl, 3-methyldiphenylmethane, 1,1-diphenylbutane, 3,3′-dimethylbiphenyl, 3,3′,4,4′-tetramethylbiphenyl, 3,3′,5,5′-tetramethylbiphenyl, diethylbiphenyl, (S)-1,2-dihydro-4,7-dimethyl-1-isopropylnaphthalene, and/or(S)-1,2-dihydro-1,6-dimethyl-4-isopropylnaphthalene.

2. The organic EL ink claim 1 , wherein the organic EL contributing material is one of a light-emitting material, a carrier transport material, a carrier injection material and a carrier blocking material.

3. The organic EL ink of claim 1 , wherein the organic EL contributing material comprises an anthracene-based light-emitting material.

4. A method of manufacturing an organic EL device comprising a structure in which an organic layer containing a light-omitting layer is sandwiched between two sheets of electrodes; the method comprising:

applying the organic EL ink of claim 1 ; and

drying the solution, thereby forming the organic layer.

5. The organic EL ink suitable for a printing apparatus, comprising:

a mixed solvent of two or more kinds of organic solvents which contain at least a first organic solvent and a second organic solvent; and

an organic EL contributing material dissolved into the mixed solvent,

wherein HSP coordinates of the first organic solvent are Hd in a range of 17.5 to 19.5 (J/cm3) 1/2 , Hp in a range of 3.5 to 5.5 (J/cm3) 1/2 and Hh in a range of 3.5 to 5.5 (J/cm3) 1/2 ,

wherein the first organic solvent comprises ethyl phenylacetate, m-tolyl acetate, o-tolyl acetate, o-methylbenzyl acetate, propyl phenylacetate, propyl 2-phenylacetate, styralyl acetate, methyl phenylacetate, methylphenyl carbonyl acetate, methylbenzyl acetate, propyl 3-phenylacetate, allyl phenylacetate, benzyl butyrate, o-cresyl isobutyrate, cresyl butyrate, p-cresyl isobutyrate, p-anisyl isobutyrate, methyl 4-phenylbutyrate, benzyl propionate, phenethyl propionate, styralyl propionate, cinnamyl propionate, p-cresyl propionate, p-methylanisole, m-methylanisole, o-methylanisole, 2,4-dimethylanisole, o-vinylanisole, 4-ethylanisole, phenylacetaldehyde ethylene acetal, benzaldehyde propylene acetal, 2-(a-methylbenzyl)-1,3-dioxolane, cinnamaldehyde dimethyl acetal, o-diethoxybenzene, p-methoxystyrene 2-ethoxynaphthalene, 4-allylanisole, 3,4-dimethoxystyrene, 1-ethoxynaphthalene, octyl methoxycinnamate, 2,5-dimethoxystyrene, 2,6-dimethoxystyrene, 1-methoxy-4-propoxybenzene, benzyl methylether, butyl phenyl ether, ethyl phenyl ether, benzyl ethyl ether, phenyl isopropyl ether, phenyl propyl ether, allyl phenyl ether phenylvinyl ether, anethole, dihydroanethole, benzalacetone, phenyl ethylidene acetone, 2-(4-isopropylphenyl)propanal, and/or 3-(4-isopropylphenyl)propanal, and

wherein the second organic solvent comprises diphenylpropane.

6. The organic EL ink claim 5 , wherein the organic EL contributing material is one of a light-emitting material, a carrier transport material, a carrier injection material and a carrier blocking material.

7. The organic EL ink of claim 5 , wherein the organic EL contributing material comprises an anthracene-based light-emitting material.

8. A method of manufacturing an organic EL device comprising a structure in which an organic layer containing a light-emitting layer is sandwiched between two sheets of electrodes; the method comprising:

applying the organic EL ink of claim 5 ; and

drying the solution, thereby forming the organic layer.