# US 2023/0265306 A1 · Ink composition for light-emitting device and light-emitting device manufactured by using the same

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- Number: US 2023/0265306 A1
- Document ID: US20230265306A1
- Status: Published application
- Kind: A1
- Application number: 18/172,286
- Filed: 2023-02-21
- Published: 2023-08-24
- Earliest claimed: 2022-02-22
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Sangyeop LEE; Jongwoo SHIN; Dukki KIM; Sehun KIM; Wonjun PARK; Jaekook HA
- Web page: https://patentgrep.com/patent/US20230265306A1

## CPC

- C09D 11/50: Sympathetic, colour changing or similar inks
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- C09D 11/033: characterised by the solvent
- C09D 11/322: Pigment inks
- C09D 11/36: based on non-aqueous solvents
- C09K 11/55: containing beryllium, magnesium, alkali metals or alkaline earth metals
- H10K 50/115: comprising active inorganic nanostructures, e.g. luminescent quantum dots
- H10K 50/16: Electron transporting layers
- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 71/135: {using ink-jet printing}
- H10K 71/15: characterised by the solvent used
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An ink composition for a light-emitting device, the ink composition including: a metal oxide; and a mixed solvent composition including a first solvent, a second solvent, and a third solvent, wherein the first solvent includes one hydroxyl group and has a boiling point of 160° C. to 270° C., the second solvent includes one hydroxyl group and has a boiling point of 270° C. to 350° C., and the third solvent includes two or more hydroxyl groups and has a boiling point of 270° C. to 350° C.

## Claims

### Claim 1

An ink composition for a light-emitting device, the ink composition comprising:
a metal oxide; and a mixed solvent composition comprising a first solvent, a second solvent, and a third solvent,
wherein the first solvent comprises one hydroxyl group and has a boiling point of 160° C. to 270° C.,
the second solvent comprises one hydroxyl group and has a boiling point of 270° C. to 350° C., and
the third solvent comprises two or more hydroxyl groups and has a boiling point of 270° C. to 350° C.

### Claim 2 (depends on 1)

The ink composition of claim 1, wherein a viscosity at 25° C. of the first solvent is in a range of 1 centipoise to 10 centipoise.

### Claim 3 (depends on 1)

The ink composition of claim 1, wherein a viscosity at 25° C. of the second solvent is in a range of 1 centipoise to 20 centipoise.

### Claim 4 (depends on 1)

The ink composition of claim 1, wherein a viscosity at 25° C.) of the third solvent is in a range of 50 centipoise to 10,000 centipoise.

### Claim 5 (depends on 1)

The ink composition of claim 1, wherein a viscosity at 25° C. of the mixed solvent composition of the first solvent, the second solvent, and the third solvent is in a range of 1 centipoise to 12 centipoise.

### Claim 6 (depends on 1)

The ink composition of claim 1, wherein a viscosity at 25° C. of a mixed solvent composition of the second solvent and the third solvent is in a range of 20 centipoise to 1,000 centipoise.

### Claim 7 (depends on 1)

The ink composition of claim 1, wherein an amount of the first solvent in the mixed solvent composition of the first solvent, the second solvent, and the third solvent is in a range of 50 volume percent to 75 volume percent.

### Claim 8 (depends on 1)

The ink composition of claim 1, wherein the first solvent comprises 4 to 15 carbon atoms and 1 to 3 oxygen atoms excluding the oxygen of the one hydroxy group.

### Claim 9 (depends on 1)

The ink composition of claim 1, wherein the second solvent comprises 8 to 18 carbon atoms and 2 or 3 oxygen atoms excluding the oxygens of the one hydroxy group.

### Claim 10 (depends on 1)

The ink composition of claim 1, wherein the first solvent comprises 3-methoxy 3-methyl butanol, 3-methoxy butanol, ethylene glycol monobutyl ether, ethylene glycol monoisobutyl ether, ethylene glycol mono t-butyl ether, ethylene glycol monopentyl ether, ethylene glycol monohexyl ether, ethylene glycol monoheptyl ether, ethylene glycol monooctyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monoisopropyl ether, diethylene glycol monopropyl ether, diethylene glycol monobutyl ether, diethylene glycol monoisobutyl ether, diethylene glycol mono t-butyl ether, diethylene glycol monopentyl ether, diethylene glycol monohexyl ether, diethylene glycol monoheptyl ether, diethylene glycol monooctyl ether, propylene glycol monopentyl ether, propylene glycol monohexyl ether, propylene glycol monoheptyl ether, propylene glycol monooctyl ether, propylene glycol mono 2-ethylhexyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monoisopropyl ether, dipropylene glycol monobutyl ether, dipropylene glycol monoisobutyl ether, dipropylene glycol mono t-butyl ether, dipropylene glycol monopentyl ether, dipropylene glycol monohexyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monopropyl ether, triethylene glycol monoisopropyl ether, or any combination thereof.

### Claim 11 (depends on 1)

The ink composition of claim 1, wherein the second solvent comprises diethylene glycol 2-ethylpentyl ether, diethylene glycol 1-ethylbutyl ether, diethylene glycol 2-ethylhexyl ether, triethylene glycol monobutyl ether, triethylene glycol monopentyl ether, triethylene glycol monohexyl ether, triethylene glycol monoheptyl ether, triethylene glycol monooctyl ether, triethylene glycol 2-ethylhexyl ether, triethylene glycol 1-ethylpentyl ether, triethylene glycol 1-ethylbutyl ether, dipropylene glycol heptyl ether, dipropylene glycol octyl ether, dipropylene glycol heptyl ether, dipropylene glycol 2-ethylhexyl ether, dipropylene glycol 1-ethylpentyl ether, dipropylene glycol 1-ethylbutyl ether, or any combination thereof.

### Claim 12 (depends on 1)

The ink composition of claim 1, wherein the third solvent comprises glycerin, sorbitol, polyethylene glycol with a molecular weight of 400 to 1,100 grams per mole, tetraethylene glycol, or any combination thereof.

### Claim 13 (depends on 1)

The ink composition of claim 1, wherein a metal of the metal oxide comprises an alkaline earth metal, a transition metal, a post-transition metal, or any combination thereof.

### Claim 14 (depends on 1)

The ink composition of claim 1, wherein the metal oxide comprises ZnO, ZnMgO, MoO3, NiO, Ni2O, Ni4O, Ni3O, Ni3O4, Ni2O3, TiO2, SnO2, Cu2O, CuO, Cu2O3, or any combination thereof.

### Claim 15 (depends on 1)

The ink composition of claim 1, wherein a concentration of metal oxide of the ink composition is in a range of 0.01 weight percent to 5 weight percent.

### Claim 16 (depends on 1)

The ink composition of claim 1, wherein a viscosity of the ink composition that has been dried under 0.1 Torr to reach 25% to 33% of an initial volume is in a range of 20 centipoise to 1,200 centipoise.

### Claim 17

A light-emitting device comprising:
a first electrode;
a second electrode facing the first electrode; and
an interlayer between the first electrode and the second electrode, the interlayer comprising an emission layer,
wherein a layer of the interlayer is prepared by using an ink composition for a light-emitting device, the ink composition comprising:
a metal oxide; and a mixed solvent composition comprising a first solvent, a second solvent, and a third solvent,
wherein the first solvent comprises one hydroxyl group and has a boiling point of 160° C. to 270° C.,
the second solvent comprises one hydroxyl group and has a boiling point of 270° C. to 350° C., and
the third solvent comprises two hydroxyl groups and has a boiling point of 270° C. to 350° C.

### Claim 18 (depends on 17)

The light-emitting device of claim 17, wherein the emission layer comprises a quantum dot.

### Claim 19 (depends on 17)

The light-emitting device of claim 17, wherein the interlayer is an electron transport layer.

### Claim 20 (depends on 17)

An electronic apparatus comprising the light-emitting device of claim 17.