# US 2010/0163797 A1 · Thulium-Containing Fluorescent Substance For White Light Emitting Diode And Manufacturing Method Thereof

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- Number: US 2010/0163797 A1
- Document ID: US20100163797A1
- Status: Published application
- Kind: A1
- Application number: 12/305,735
- Filed: 2007-06-05
- Published: 2010-07-01
- Earliest claimed: 2006-06-21
- Assignees: Daejoo Electronic Material Co., Ltd.
- Inventors: Sang-hyuk Han; Jae-seob Hwang; Il-ji Lim
- Web page: https://patentgrep.com/patent/US20100163797A1

## CPC

- C09K 11/77922: {Silicates}
- C09K 11/77342: {Silicates}
- H10H 20/8512: {Wavelength conversion materials}
- Y02B 20/00: Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

Disclosed is a thulium-containing fluorescent substance for a white light emitting diode represented by a following chemical formula 1, (Chemical Formula 1) (M1-X-J7EuxTnIy)2SiO4 where M is a divalent cation metal including Sr or Ba, with 0.005<x<0.05 and 0.005<y<0.05. The silicate-based yellow fluorescent substance according to the present invention is sufficiently excited by a blue light source generated by a blue LED to exhibit a yellow emission, with superior luminous intensity, due to the addition of europium oxide (Eu2O3) and thulium oxide (Tm2O3) as an activator, thereby being suitable for a white LED.

## Claims

### Claim 1

A thulium-containing fluorescent substance for a white light emitting diode, characterized in that the fluorescent substance is represented by a following chemical formula 1,
[Chemical Formula 1]
(M1-x-yEuxTmy)2SiO4
where M is a divalent cation metal including Sr or Ba with 0.005≦x≦0.05 and 0.005≦y≦0.05.

### Claim 2 (depends on 1)

The thulium-containing fluorescent substance for a white light emitting diode according to claim 1, characterized in that the europium oxide and thulium oxide are used to become 1≦x/y≦5.

### Claim 3 (depends on 1)

A method of manufacturing a thulium-containing fluorescent substance for a white light emitting diode as a manufacturing method of claim 1, characterized in that a silicate-based compound is used as a parent substance, the method comprising the steps of:
adding europium oxide (Eu2O3) and thulium oxide (Tm2O3) to this substance and mixing them together;
thermally treating a material obtained in the mixing step in a temperature between 1,000˜1,500° C.; and
post-processing including a pulverizing process.

### Claim 4

A thulium-containing fluorescent substance for a white light emitting diode, characterized in that the fluorescent substance is represented by a following chemical formula 2,
[Chemical Formula 2]
(M1-x-y-z-αEuxTmyAzRα)2SiO4
where M is a divalent cation metal including Sr or Ba, and A is a univalent cation metal including Li or K with 0.00≦z≦0.05, and R is a rare earth metal including Ce, Pr, Sin or Gd with 0.00≦α≦0.05.

### Claim 5 (depends on 4)

A method of manufacturing a thulium-containing fluorescent substance for a white light emitting diode as a manufacturing method of claim 4, characterized in that a silicate-based compound is used as a parent substance, the method comprising the steps of:
adding europium oxide (Eu2O3), thulium oxide (Tm2O3), lithium carbonate (Li2CO3), and gadolinium oxide (Gd2O3) to this substance and mixing them together;
thermally treating a material obtained in the mixing step in a temperature between 1,000˜1,500° C.; and
post-processing including a pulverizing process.