Phosphor and manufacturing method for the same, and light source

• US 20090109652A1
• Filed: 11/28/2008
• Published: 04/30/2009
• Est. Priority Date: 08/27/2004
• Status: Active Grant

• Current Assignee: Citizen Electronics Company Limited
• Original Assignee: Dowa Electronics Materials Co. Ltd. (DOWA Holdings Company Limited), Nichia Corporation
• Inventors: Gotoh, Masahiro, Nagatomi, Akira, Yamashita, Shuji, Sakane, Kenji, Ikuta, Tetsuya
• Granted Patent: US 7,803,286 B2
• Time in Patent Office: Days
• US Class Current: 362/84
• CPC Class Codes: C09K 11/0883 Arsenides; Nitrides; Phosphides
• CPC Class Codes: C09K 11/77348 Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: Y10T 428/2991 Coated
• CPC Class Codes: Y10T 428/2993 Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]

Abstract

To provide a phosphor having an emission spectrum with a broad peak in a range from yellow color to red color (580 nm to 680 nm) and an excellent excitation band on the longer wavelength side from near ultraviolet/ultraviolet of excitation light to visible light (250 nm to 550 nm), and having an improved emission intensity. The phosphor is provided, which is given by a general composition formula expressed by MmAaBbOoNn:Z, (wherein element M is more than one kind of element having bivalent valency, element A is more than one kind of element having tervalent valency selected from the group consisting of Al, Ga, In, Tl, Y, Sc, P, As, Sb, and Bi, element B is more than one kind of element having tetravalent valency, O is oxygen, N is nitrogen, and element Z is more than one kind of element selected from rare earth elements or transitional metal elements, satisfying m>0, a>0, b>0 o≧0, and n=2/3m+a+4/3b−2/3o), and further containing boron and/or fluorine.

Claims

1. A phosphor, which is given by a general composition formula expressed by MmAaDbOoNn:

Z, (wherein element M is at least one kind of element having bivalent valency, element A is at least one kind of element having tervalent valency selected from the group consisting of Al, Ga, In, Tl, Y, Sc, P, As, Sb, and Bi, element D is at least one kind of element having tetravalent valency, O is oxygen, N is nitrogen, and element Z is at least one kind of element selected from rare earth elements or transitional metal elements, expressed by m=a=b=1 and n=2/3 m+a+4/3b−

2/3o), and further containing boron or fluorine or boron and fluorine.

4. A light source, comprising the phosphor according to claim 1, and a light emitting part.

5. The light source according to claim 4, wherein a wavelength range of light emitted from the light emitting part is 250 nm to 550 nm.

6. The light source according to claim 4, wherein an LED (light emitting diode) is used as the light emitting part.

2. A manufacturing method of a phosphor,

containing a phosphor crystal which is given by a general composition formula expressed by MmAaDbOoNn:

Z, (wherein element M is at least one kind of element having bivalent valency, element A is at least one kind of element having tervalent valency selected from the group consisting of Al, Ga, In, Tl, Y, Sc, P, As, Sb, and Bi, element D is at least one kind of element having tetravalent valency, O is oxygen, N is nitrogen, and element Z is at least one kind of element selected from rare earth elements or transitional metal elements, and further containing boron or fluorine or boron and fluorine expressed by m=a=b=1, and n=2/3 m+a+4/3b−

2/3o),

said method comprising the steps of;

weighing and mixing the raw materials in an inert atmosphere to manufacture a mixture;

firing this mixture by using a BN crucible to manufacture a fired substance; and

pulverizing this fired substance to manufacture the phosphor,

wherein the compound containing the element M, the compound containing the element A, the compound containing the element D, and the compound containing the element Z or a simple substance of the element Z, and by using a BN crucible, boron is included in the raw materials from the BN crucible, and the phosphor containing the boron is manufactured.

3. A manufacturing method of a phosphor,

containing a phosphor crystal which is given by a general composition formula expressed by MmAaDbOoNn:

Z, (wherein element M is at least one kind of element having bivalent valency, element A is at least one kind of element having tervalent valency selected from the group consisting of Al, Ga, In, Tl, Y, Sc, P, As, Sb, and Bi, element D is at least one kind of element having tetravalent valency, O is oxygen, N is nitrogen, and element Z is at least one kind of element selected from rare earth elements or transitional metal elements, and further containing a boron compound or a fluorine compound or a boron compound and a fluorine compound expressed by m=a=b=1, and n=2/3 m+a+4/3b−

2/30),

said method comprising the steps of;

weighing and mixing the raw materials in an inert atmosphere to manufacture a mixture;

firing this mixture to manufacture a fired substance, and

pulverizing this fired substance to manufacture the phosphor,

wherein the boron compound or the fluorine compound or the boron compound and the fluorine compound are further added to a raw material of the phosphor expressed by the composition formula MmAaDbOoNn;

Z.