# US 2014/0151732 A1 · Blue light-emitting phosphor and light-emitting device using same

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- Number: US 2014/0151732 A1
- Document ID: US20140151732A1
- Status: Published application
- Kind: A1
- Application number: 14/001,532
- Filed: 2012-02-24
- Published: 2014-06-05
- Earliest claimed: 2011-02-28
- Assignees: Ube Material Industries, Ltd.
- Applicants: Ube Material Industries, Ltd.
- Inventors: Kouichi Fukuda; Jin Amagai; Seiji Noguchi; Toru Inagaki; Masaki Tanaka
- Web page: https://patentgrep.com/patent/US20140151732A1

## CPC

- H10H 20/8512: {Wavelength conversion materials}
- C09K 11/77922: {Silicates}
- H10W 72/884: {Die-attach connectors and bond wires}
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

A blue light-emitting Eu-activated silicate phosphor having a constitutional formula of Sr3MgSi2O8 which contains Eu in an amount of 0.001 to 0.2 mol per one mole of Mg and further a rare earth metal element selected from the group consisting of Sc, Y, Gd, Tb and La in an amount of 0.0001 to 0.03 mol, per one mole of Mg, gives an emission with enhanced emission strength when it is excited with a light having a wavelength in the region of 350 to 430 nm.

## Claims

### Claim 1

A blue light-emitting Eu-activated silicate phosphor having a constitutional formula of Sr3MgSi2O8 containing Eu in an amount of 0.001 to 0.2 mol per one mole of Mg and a rare earth metal element selected from the group consisting of Sc, Y, Gd, Tb and La in an amount of 0.0001 to 0.03 mol, per one mole of Mg, said Eu-activated silicate phosphor emitting a blue light when it is excited with a light having a wavelength region of 350 to 430 nm.

### Claim 2 (depends on 1)

The blue light-emitting phosphor of claim 1, in which Eu is contained in an amount of 0.01 to 0.2 mol, per one mole of Mg.

### Claim 3 (depends on 1)

The blue light-emitting phosphor of claim 1, in which Eu is contained in an amount of 0.01 to 0.15 mol, per one mole of Mg.

### Claim 4 (depends on 1)

The blue light-emitting phosphor of claim 1, in which Eu is contained in an amount of 1 or more in terms of molar ratio, to the amount of the rare earth metal element.

### Claim 5 (depends on 1)

The blue light-emitting phosphor of claim 1, in which the rare earth metal element is contained in an amount of 0.0005 to 0.02 mol, per one mole of Mg.

### Claim 6 (depends on 1)

A light-emitting device comprising the blue light-emitting phosphors of claim 1 and a semiconductor element emitting a light having a wavelength in the region of 350 to 430 nm by applying electric current thereto.

### Claim 7 (depends on 1)

A light-emitting device comprising the blue light-emitting phosphors of claim 1, a phosphor emitting a green light when excited with a light having a wavelength in the region of 350 to 430 nm, a phosphor emitting a red light when excited with a light having a wavelength in the region of 350 to 430 nm, and a semiconductor element emitting a light having a wavelength in the region of 350 to 430 nm by applying electric current thereto.