Phosphor and manufacturing method for the same, and light source

• US 20100301272A1
• Filed: 04/19/2010
• Published: 12/02/2010
• Est. Priority Date: 07/28/2004
• Status: Active Grant

• Current Assignee: Citizen Electronics Company Limited, Nichia Corporation
• Original Assignee: Dowa Electronics Materials Co. Ltd. (DOWA Holdings Company Limited), Nichia Corporation
• Inventors: Gotoh, Masahiro, Nagatomi, Akira, Yamashita, Shuji, Sakane, Kenji
• Granted Patent: US 8,066,910 B2
• Time in Patent Office: Days
• US Class Current: 252/301.4F
• 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: H05B 33/14 characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source

Abstract

To provide a phosphor having an emission characteristic such that a peak wavelength of light emission is in a range from 580 to 680 nm, and having a high emission intensity, and having a flat excitation band with high efficiency for excitation light in a broad wavelength range from ultraviolet to visible light (wavelength range from 250 nm to 550 nm). For example, Ca₃N₂(2N), AlN(3N), Si₃N₄(3N), Eu₂O₃(3N) are prepared, and after weighing and mixing a predetermined amount of each raw material, raw materials are fired at 1500° C. for 6 hours, thus obtaining the phosphor including a product phase expressed by a composition formula CaAlSiN₃:Eu and having an X-ray diffraction pattern satisfying a predetermined pattern.

Claims

1. A phosphor comprising:

a product phase

expressed by a composition formula MADOoNn;

Z, where element M is at least one or more kind of element having bivalent valency, element A is at least one or more kind of element having tervalent valency, element D is at least one or more kind of element selected from the elements having tetravalent valency, O is oxygen, N is nitrogen, and element Z is at least one more kind of element selected from rare earth elements or transitional metal elements satisfying n=3-2/30, o+n>

8/3, and

showing a diffraction peak with relative intensity of 10% or more in the Bragg angle (2θ

) range from 36.5°

to 37.5° and

from 41.9°

to 42.9°

of the X-ray diffraction pattern, when the relative intensity of the diffraction peak having a highest intensity in a powder X-ray diffraction pattern by CoKα

ray is defined as 100%,

wherein

a crystal lattice volume of the product phase is 280.5 Å

³ or more.

2. The phosphor according to claim 1,

wherein

a crystallite size of the product phase is 90 nm or more.

3. The phosphor according to claim 1,

wherein

the element M is one or more kind of element having bivalent valency, indispensably including Ca;

the element A is one or more kind of element having tervalent valency, indispensably including Al; and

the element D is one or more kind of element having tetravalent valency, indispensably including Si.

4. A light source manufactured using the phosphor according to claim 1.