Phosphor and production method thereof, phosphor-containing composition, light emitting device, illuminating device, display, and nitrogen-containing compound

1. A phosphor comprising a crystal phase represented by formula [I],

R 3−x−y−z+w2 M z A 1.5x+y−w2 Si 6−w1−w2 Al W1+w2 O y+w1 N 11−y−w1   [I]

wherein,

R represents at least one kind of a rare-earth element selected from the group consisting of La, Gd, Lu, Y and Sc, wherein La is used in an amount of at least 70 mol percent relative to the total amount of R,

M represents at least one kind of a metal element selected from the group consisting of Ce, Eu, Mn, Yb, Pr and Tb,

A represents at least one kind of a bivalent metal element selected from the group consisting of Ba, Sr, Ca, Mg and Zn, and

x, y, z, w1 and w2 are the numeric values wherein:

( 1/7)≦(3− x−y−z+w 2)/6<(½),

0<(1.5 x+y−w 2)/6<(9/2),

0<x<3,

0≦y<2,

0<z<1,

0<w1≦5,

0≦w2≦5, and

0≦ w 1+ w 2≦0.4,

wherein color coordinates x and y, in CIE standard colorimetric system, of the luminescent color when excited with light having 460-nm wavelength are in the ranges of 0.420≦x≦0.600 and 0.400≦y≦0.570, respectively.

2. The phosphor according to claim 1 , wherein

a wavelength of emission peak when excited with light of 460-nm wavelength is 480 nm or longer.

3. A phosphor

comprising a crystal phase represented by formula [II],

obtained by, as at least a part of a raw material, an alloy comprising two or more kinds of the metal elements that are in said crystal phase, wherein

R 3−x−y−z+w2 M z A 1.5x+y−w2 Si 6−w1−w2 Al W1+w2 O y+w1 N 11−y−w1   [II]

wherein,

R represents at least one kind of a rare-earth element selected from the group consisting of La, Gd, Lu, Y and Sc, wherein La is used in an amount of at least 70 mol percent relative to the total amount of R,

M represents at least one kind of a metal element selected from the group consisting of Ce, Eu, Mn, Yb, Pr and Tb,

A represents at least one kind of a bivalent metal element selected from the group consisting of Ba, Sr, Ca, Mg and Zn, and

x, y, z, w1 and w2 are the numeric values wherein:

( 1/7)≦(3− x−y−z+w 2)/6<(½),

0≦(1.5 x+y−w 2)/6<(9/2),

0≦x<3,

0≦y<2,

0<z<1,

0≦w 2 ≦5, and

0 ≦w 1 +w 2≦0.4,

wherein the color coordinates x and y, in CIE standard colorimetric system, of the luminescent color when excited with light having 460-nm wavelength are in the ranges of

0.320≦x≦0.600 and

0.400≦y≦0.570.

4. The phosphor according to claim 3 , wherein

a wavelength of emission peak when excited with light of 460-nm wavelength is 480 nm or longer.

5. The phosphor according to claim 4 , wherein

an emission spectrum when excited with light of 460-nm wavelength satisfies the formula [B],

I ( B )/ I ( A )≦0.88  [B]

wherein,

I(A) represents an emission intensity of the maximum peak wavelength that is present in the wavelength range of 500 nm or longer and 550 nm or shorter, and

I(B) represents an emission intensity of the wavelength that is longer than the maximum peak wavelength by 45 nm.

6. The phosphor according to claim 3 , wherein

in the powder X-ray diffraction pattern measured with CuKα line (1.54184 Å),

a peak exists at 2θ from 17° to 20°, and

a peak intensity ratio I, related to a peak present at 2θ from 21° to 24°, is 0.05 or smaller, where

the peak intensity ratio I is defined by, in the powder X-ray diffraction pattern at 2θ ranging from 10° to 60°, the ratio of the height Ip of the peak present at 2θ from 21° to 24°, to the height Imax of the most-intensive peak present at 2θ from 17° to 20°, and

the values of the peak intensities are obtained after background correction.

7. The phosphor according to claim 3 , wherein,

in the formula [II], x and y satisfy

0<(1.5 x+y−w 2)/6<(9/2) and

0<x<3.

8. The phosphor according to claim 3 , wherein,

the full width at half maximum of the emission peak when excited with light of 460-nm wavelength is 100 nm or longer.

9. A method for producing a phosphor comprising a crystal phase represented by the formula [II],

obtained by, as at least a part of a raw material, an alloy comprising two or more kinds of the metal elements that are included in said crystal phase,

comprising nitriding the alloy by firing in a nitrogen-containing atmosphere, wherein

R 3−x−y−z+w2 M z A 1.5x+y−w2 Si 6−w1−w2 Al W1+w2 O y+w1 N 11−y−w1   [II]

wherein,

R represents at least one kind of a rare-earth element selected from the group consisting of La, Gd, Lu, Y and Sc, wherein La is used in an amount of at least 70 mol percent relative to the total amount of R,

M represents at least one kind of a metal element selected from the group consisting of Ce, Eu, Mn, Yb, Pr and Tb,

A represents at least one kind of a bivalent metal element selected from the group consisting of Ba, Sr, Ca, Mg and Zn, and

x, y, z, w1 and w2 are the numeric values:

( 1/7)≦(3 −x−y−z+w 2)/6<(½),

0≦(1.5 x+y−w 2)/6<(9/2),

0≦x<3,

0≦y<2,

0<z<1,

0≦w1≦5

0≦w2≦5, and

0≦w1+w2≦0.4,

wherein the color coordinates x and y, in CIE standard colorimetric system, of the luminescent color when excited with light having 460-nm wavelength are in the ranges of

0.320≦x≦0.600 and

0.400≦y≦0.570.

10. The method for producing a phosphor, according to claim 9 , wherein

the raw material comprises the alloy and a nitride.

11. A phosphor-containing composition comprising:

said phosphor according to claim 1 and a liquid medium.

12. A light emitting device comprising: a first luminous body and a second luminous body that emits visible light when irradiated with light from said first luminous body, wherein

said light emitting device comprises, as said second luminous body, a first phosphor comprising at least one kind of said phosphor according to claim 1 .

13. A light emitting device according to claim 12 , wherein

said light emitting device comprises, as said second luminous body, a second phosphor comprising at least one kind of a phosphor of which wavelength of emission peak is different from that of said first phosphor.

14. An illuminating device comprising a light emitting device according to claim 12 .

15. A display comprising a light emitting device according to claim 12 .

16. A nitrogen-containing compound comprising a crystal phase represented by the formula [I],

R 3−x−y−z+w2 M z A 1.5x+y−w2 Si 6−w1−w2 Al W1+w2 O y+w1 N 11−y−w1   [I]

where

R represents at least one kind of a rare-earth element selected from the group consisting of La, Gd, Lu, Y and Sc, wherein La is used in an amount of at least 70 mol percent relative to the total amount of R,

M represents at least one kind of a metal element selected from the group consisting of Ce, Eu, Mn, Yb, Pr and Tb,

A represents at least one kind of a bivalent metal element selected from the group consisting of Ba, Sr, Ca, Mg and Zn,

x, y, z, w1 and w2 are the numeric values in the following ranges:

( 1/7)≦(3 −x−y−z+w 2)/6<(½)

0<(1.5 x+y−w 2)/6<(9/2),

0<x<3,

0≦y<2,

0<z<1,

0≦w1≦5,

0≦w2≦5, and

0≦ w 1+ w 2≦0.4,

wherein the color coordinates x and y, in CIE standard colorimetric system, of the luminescent color when excited with light having 460-nm wavelength are in the ranges of

0.320≦x≦0.600 and

0.400≦y≦0.570.

17. The phosphor according to claim 1 , wherein w1+w2=0.

18. The phosphor according to claim 3 , wherein w1+w2=0.

19. The method for producing a phosphor according to claim 9 , wherein w1+w2=0.

20. The nitrogen containing compound according to claim 16 , wherein w1+w2=0.