# US 8,465,798 B2 · Method for manufacturing phosphor and light emitting device comprising the phosphor

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- Number: US 8,465,798 B2
- Document ID: US8465798B2
- Status: Granted
- Kind: B2
- Application number: 12/949,879
- Filed: 2010-11-19
- Published: 2011-06-09
- Granted: 2013-06-18
- Earliest claimed: 2009-12-04
- Assignees: LG Innotek Co., Ltd.
- Applicants: Yun Soo Song; Sang Hyuk Lee
- Inventors: Yun Soo Song; Sang Hyuk Lee
- Web page: https://patentgrep.com/patent/US8465798B2

## CPC

- C09K 11/77342: {Silicates}
- C09K 11/02: Use of particular materials as binders, particle coatings or suspension media therefor
- H10H 20/8513: {having two or more wavelength conversion materials}
- H10H 20/0361: {of wavelength conversion means}
- H10W 90/756: {between a chip and a stacked lead frame, conducting package substrate or heat sink}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

Disclosed is a method for manufacturing a fluorescent material. The method includes: putting the fluorescent material into a first solution, and agitating the fluorescent material and the first solution; putting a nano fluorescent material having a nano size into the first solution, and agitating the nano fluorescent material having a nano size and the first solution; and separating supernatant from the first solution including the fluorescent material, and drying the fluorescent material. Disclosed is a light emitting device. The light emitting device includes: a body; a light emitting element mounted on a cavity formed in the body; a resin formed in the cavity; and a fluorescent material added to the resin, wherein a nano fluorescent material having a nano size is adsorbed in the fluorescent material.

## Claims

### Claim 1

A method for manufacturing a silicate based fluorescent material, the method comprising:
putting the silicate based fluorescent material into a first solution, and agitating the silicate based fluorescent material and the first solution;
putting a nano fluorescent material having a nano size and acetic acid into the first solution, and agitating the nano fluorescent material having the nano size, the acetic acid and the first solution;
attaching the nano fluorescent material to a surface of the silicate based fluorescent material; and
separating a supernatant from the first solution including the silicate based fluorescent material, and drying the silicate based fluorescent material,
wherein the nano fluorescent material comprises the same material as that of the fluorescent material.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first solution is at least one selected from the group consisting of de-ionized (DI) water, ethanol, acetone, methanol and isopropyl alcohol.

### Claim 3 (depends on 1)

The method of claim 1, further comprising, prior to putting the silicate based fluorescent material into the first solution and agitating the silicate based fluorescent material and the first solution, heating and agitating the first solution until the temperature of the first solution reaches a predetermined temperature.

### Claim 4 (depends on 1)

The method of claim 1, wherein the putting the silicate based fluorescent material into the first solution and agitating the silicate based fluorescent material and the first solution comprises heating and agitating the first solution such that the temperature of the first solution does not fall below a predetermined temperature.

### Claim 5 (depends on 4)

The method of claim 4, wherein the predetermined temperature is 50 degrees Celsius.

### Claim 6 (depends on 1)

The method of claim 1, wherein the nano fluorescent material is manufactured through a thermo spray decomposition method.

### Claim 7 (depends on 1)

The method of claim 1, wherein, after the putting the nano fluorescent material and the acetic acid, the first solution is heated and agitated such that the temperature of the first solution does not fall below a predetermined temperature.

### Claim 8 (depends on 1)

The method of claim 1, wherein, after the putting the nano fluorescent material having the nano size into the first solution, and agitating the nano fluorescent material having the nano size and the first solution, additional ZnSO4 solution is put into the first solution and agitated.