# US 2014/0152173 A1 · Rare earth aluminum garnet type phosphor and light-emitting device using the same

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- Number: US 2014/0152173 A1
- Document ID: US20140152173A1
- Status: Published application
- Kind: A1
- Application number: 14/143,961
- Filed: 2013-12-30
- Published: 2014-06-05
- Earliest claimed: 2011-07-05
- Assignees: Panasonic Corporation
- Applicants: Panasonic Corporation
- Inventors: Shozo OSHIO; Kojiro OKUYAMA
- Web page: https://patentgrep.com/patent/US20140152173A1

## CPC

- C09K 11/7792: {Aluminates}
- C09K 11/7706: {Aluminates}
- C09K 11/7774: {Aluminates}
- H10H 20/8512: {Wavelength conversion materials}
- H10W 72/5522: {comprising gold [Au]}
- 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

The present invention provides a new phosphor with a controllable emission wavelength without using a number of rare and expensive raw materials in forming the composition. The phosphor includes a compound including a fluorescent ion and having a garnet structure including a rare earth element, aluminum, and oxygen. The compound has such a composition that a combination of the rare earth element and the aluminum of the compound is partially replaced with a combination of alkaline earth metal and zirconium (Zr) or alkaline earth metal and hafnium (Hf).

## Claims

### Claim 1

A rare earth aluminum garnet type phosphor, comprising a compound including a fluorescent ion and having a garnet structure including a rare earth element, aluminum, and oxygen,
wherein the compound has a composition in which a combination of the rare earth element and the aluminum of the compound is partially replaced with a combination of alkaline earth metal and zirconium (Zr) or alkaline earth metal and hafnium (Hf).

### Claim 2 (depends on 1)

The rare earth aluminum garnet type phosphor according to claim 1,
wherein the rare earth element is at least one of yttrium, lanthanum and lutetium, and
the compound belongs to a yttrium aluminum garnet type, a lanthanum aluminum garnet type or a lutetium aluminum garnet type.

### Claim 3 (depends on 1)

The rare earth aluminum garnet type phosphor according to claim 1, wherein the total number of atoms of the partially replacing alkaline earth metal is greater than 0.1 and smaller than or equal to 2.0 with respect to 12 anions constituting the compound having a garnet structure.

### Claim 4 (depends on 1)

The rare earth aluminum garnet type phosphor according to claim 1, wherein the number of atoms of the rare earth element is greater than or equal to 1 and less than 2 with respect to 12 anions constituting the compound having a garnet structure.

### Claim 5 (depends on 2)

The rare earth aluminum garnet type phosphor according to claim 2, wherein the compound is a compound including a fluorescent ion and represented by the chemical formula Ln3-xMxAl5-xXxO12, where Ln is a rare earth element including at least one of yttrium (Y), lanthanum (La), and lutetium (Lu), M is alkaline earth metal, X is at least one transition metal selected from zirconium (Zr) and hafnium (HO, and x satisfies 0<x≦2.

### Claim 6 (depends on 1)

The rare earth aluminum garnet type phosphor according to claim 1, wherein the alkaline earth metal includes at least calcium (Ca).

### Claim 7 (depends on 5)

The rare earth aluminum garnet type phosphor according to claim 5, wherein x is equal to 2.

### Claim 8 (depends on 5)

The rare earth aluminum garnet type phosphor according to claim 5, wherein the compound is represented by any one of the chemical formulas Y3-xCaxAl5-xZrxO12, Y3-xCaxAl5-xHfxO12, La1-xCaxAl5-xZrxO12, and Lu3-xCaxAl5-xZrxO12, where x satisfies 0<x≦2.

### Claim 9 (depends on 1)

The rare earth aluminum garnet type phosphor according to claim 1, wherein the fluorescent ion includes Ce3+.

### Claim 10 (depends on 9)

The rare earth aluminum garnet type phosphor according to claim 9, wherein the fluorescent ion further includes at least one ion selected from Pr3+, Tb3+ and Mn2+.

### Claim 11 (depends on 1)

The rare earth aluminum garnet type phosphor according to claim 1, wherein the rare earth aluminum garnet type phosphor includes no artificially added Ga, Lu or Sc.

### Claim 12 (depends on 1)

A light-emitting device comprising a phosphor and a light source for generating primary light with which the phosphor is irradiated,
wherein the rare earth aluminum garnet type phosphor according to claim 1 is used as the phosphor, and the primary light is wavelength converted into long wavelength light and the long wavelength light is emitted by the light-emitting device.

### Claim 13 (depends on 12)

The light-emitting device according to claim 12, wherein a semiconductor solid-state light-emitting element having an emission peak in a wavelength range of 400 nm to 480 nm is used as the light source for generating primary light, and the light-emitting device emits light having an emission peak in a range of 485 nm or more.