# US 7,745,984 B2 · Composition for preparing electron emission source, method for preparing electron emission source using the composition, and electron emission source

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- Number: US 7,745,984 B2
- Document ID: US7745984B2
- Status: Granted
- Kind: B2
- Application number: 11/251,809
- Filed: 2005-10-18
- Published: 2006-04-20
- Granted: 2010-06-29
- Earliest claimed: 2004-10-19
- Assignees: Samsung SDI Co., Ltd.
- Inventors: Hyun-Jee Lee; Chang-Wook Kim
- Web page: https://patentgrep.com/patent/US7745984B2

## CPC

- H01J 63/02: Details, e.g. electrode, gas filling, shape of vessel
- B82Y 10/00: Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
- H01J 1/3048: {Distributed particle emitters}
- H01J 9/025: {of field emission cathodes}
- H01J 2201/30469: Carbon nanotubes (CNTs)
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES

## Abstract

Provided are a composition for preparing an electron emission source, including a nano-sized inorganic material and a vehicle, a method for preparing an electron emission source using the composition, an electron emission source including a nano-sized inorganic material and a small amount of a residual carbon, and further, an electron emission device including the electron emission source.

## Claims

### Claim 1

A composition for preparing an electron emission source, the composition comprising:
a vehicle; and
inorganic nanotubes or inorganic nanowires dispersed in the vehicle,
wherein the inorganic nanotubes or the inorganic nanowires comprise a nitride, a carbide, a oxide, a sulfide, or a phosphide including at least one element selected from the group consisting of a group 4 element, a group 5 element, a group 6 element, a group 12 element, Ga, In and Si,
wherein the composition, when heated, provides a residual carbon being 20 to 300 parts by weight, based on 100 parts by weight of the inorganic nanotubes or inorganic nanowires.

### Claim 2 (depends on 1)

The composition of claim 1, wherein the inorganic nanotubes or inorganic nanowires have an aspect ratio of approximately 10˜1000.

### Claim 3 (depends on 1)

The composition of claim 1, wherein the inorganic nanotubes or inorganic nanowires comprises at least one inorganic material selected from a group consisting of TiS2, TaS2, MoS2, WS2, ZnO, ZnS, GaN, InP, SiC, and SiO2.

### Claim 4 (depends on 1)

The composition of claim 1, wherein the vehicle comprises at least one resin component selected from a group consisting of cellulose-based resin, acryl-based resin, and vinyl-based resin and at least one solvent component selected from the group consisting of terpineol, butyl carbitol, butyl carbitol acetate, toluene, and texanol.

### Claim 5 (depends on 1)

The composition of claim 1, further comprising at least one selected from a group consisting of an adhesive component, a photosensitive resin and a photoinitiator, and a filler.

### Claim 6

A method for preparing an electron emission source, comprising:
applying a composition on a substrate, the composition comprising inorganic nanotubes or inorganic nanowires dispersed in a vehicle; and
heat-treating the composition applied on the substrate, the heat-treating yielding residual carbon being 20 to 300 parts by weight, based on 100 parts by weight of the inorganic nanotubes or inorganic nanowires,
wherein the inorganic nanotubes or the inorganic nanowires comprise a nitride, a carbide, a oxide, a sulfide, or a phosphide including at least one element selected from the group consisting of a group 4 element, a group 5 element, a group 6 element, a group 12 element, Ga, In and Si.

### Claim 7 (depends on 6)

The method of claim 6, wherein the applying the composition comprises:
coating the composition on the substrate and exposing and developing the composition at a predetermined region,
wherein the composition further comprises a photosensitive resin and a photoinitiator.

### Claim 8 (depends on 6)

The method of claim 6, wherein the heat-treating is performed in the presence of oxygen gas, inert gas, or a mixture thereof.

### Claim 9 (depends on 6)

The method of claim 6, wherein the heat-treating is performed at approximately 400˜500° C.

### Claim 10

An electron emission source, comprising:
inorganic nanotubes or inorganic nanowires; and
a residual carbon,
wherein the residual carbon is 20 to 300 parts by weight, based on 100 parts by weight of the inorganic nanotubes or inorganic nanowires, and
wherein the inorganic nanotubes or the inorganic nanowires comprise a nitride, a carbide, a oxide, a sulfide, or a phosphide including at least one element selected from the group consisting of a group 4 element, a group 5 element, a group 6 element, a group 12 element, Ga, In and Si.

### Claim 11 (depends on 10)

The electron emission source of claim 10, wherein the electron emission source has a current density of approximately 400˜1100 μA/cm2, as determined at 5 V/μm.

### Claim 12

An electron emission device, comprising:
a first substrate and a second substrate disposed opposite to each other;
a cathode electrode on the first substrate;
an electron emission source coupled with the cathode electrode;
an anode electrode on the second substrate; and
a fluorescent layer emitting light by an electron emitted from the electron emission source,
wherein the electron emission source comprises inorganic nanotubes or inorganic nanowires and a residual carbon,
wherein the residual carbon is 20 to 300 parts by weight, based on 100 parts by weight of the inorganic nanotubes or inorganic nanowires, and
wherein the inorganic nanotubes or the inorganic nanowires comprise a nitride, a carbide, a oxide, a sulfide, or a phosphide including at least one element selected from the group consisting of a group 4 element, a group 5 element, a group 6 element, a group 12 element, Ga, In and Si.

### Claim 13 (depends on 12)

The electron emission device of claim 12, wherein the electron emission source has a current density of 400˜1100 μA/cm2, as determined at 5 V/μm.

### Claim 14 (depends on 1)

The composition of claim 1, wherein the viscosity of the composition is 3,000 to 50,000 cps.

### Claim 15

An electron emission source, comprising:
inorganic nanotubes or inorganic nanowires; and
a residual carbon,
wherein the residual carbon is a solid material remaining after heat treatment of an exposure product of a vehicle comprising organic compounds, and
wherein the inorganic nanotubes or the inorganic nanowires comprise a nitride, a carbide, a oxide, a sulfide, or a phosphide including at least one element selected from the group consisting of a group 4 element, a group 5 element, a group 6 element, a group 12 element, Ga, In and Si.

### Claim 16

An electron emission device, comprising:
a first substrate and a second substrate disposed opposite to each other;
a cathode electrode on the first substrate;
an electron emission source coupled with the cathode electrode;
an anode electrode on the second substrate; and
a fluorescent layer emitting light by an electron emitted from the electron emission source,
wherein the electron emission source comprises inorganic nanotubes or inorganic nanowires, and a residual carbon, the residual carbon being a solid material remaining after heat treatment of an exposure product of a vehicle comprising organic compounds, and wherein the inorganic nanotubes or the inorganic nanowires comprise a nitride, a carbide, a oxide, a sulfide, or a phosphide including at least one element selected from the group consisting of a group 4 element, a group 5 element, a group 6 element, a group 12 element, Ga, In and Si.

### Claim 17

A composition for preparing an electron emission source, the composition comprising:
a vehicle; and
inorganic nanotubes or inorganic nanowires dispersed in the vehicle,
wherein the composition, when heated, provides a residual carbon being 20 to 300 parts by weight, based on 100 parts by weight of the inorganic nanotubes or inorganic nanowires.