Phosphor, phosphor-containing composition and light-emitting unit using phosphor, and image display device and lighting device using light-emitting unit

1. A phosphor, comprising a crystal phase having a chemical composition represented by the following formula [1], and having an emission peak in a wavelength range of 600 nm to 650 nm,

A a B b C c D d X x :R  formula [1],

wherein

A represents one or more alkali metal elements,

B represents one or more alkaline earth metal elements,

C represents one or more elements selected from the group consisting of Group 3 elements and Group 13 elements of the periodic table,

D represents one or more elements selected from the group consisting of Group 4 elements and Group 14 elements of the periodic table,

X represents one or more halogen elements that include at least F,

R represents an element that includes at least a tetravalent Mn, and

a, b, c, d, and x each represent a number that satisfies

0<a<2,

0<b<1,

0<c<1,

0<d≦1,

0.8≦c+d≦1.2,

and

5.0≦x≦7.0.

2. A phosphor, comprising a crystal phase having a chemical composition represented by the following formula [2], the crystal phase having no garnet structure, and the phosphor having an emission peak in a wavelength range of 600 nm to 650 nm by being activated by at least Mn 4+ ,

A 2 aii B 2 bii C 2 cii D 2 dii X 2 xii tm formula [2],

wherein

A 2 represents one or more alkali metal elements,

B 2 represents one or more alkaline earth metal elements,

C 2 represents one or more elements selected from the group consisting of Group 3 elements and Group 13 elements of the periodic table,

D 2 represents one or more elements selected from the group consisting of Group 4 elements and Group 14 elements of the periodic table,

X 2 represents one or more halogen elements, and

aii, bii, cii, dii, and xii each represent a number that satisfies

0≦aii<1,

0<bii<1,

0<cii<1,

0≦dii<1,

0<xii<1,

and

aii+bii+cii+dii+xii=1.

3. The phosphor according to claim 2 , wherein

the ratio (Z2/Z8) of the number (Z2) of the alkaline earth metal elements contained as B 2 with respect to the total number (Z8) of elements contained in the phosphor is 0.05 or more, and

the ratio (Z3/Z8) of the number (Z3) of the elements C 2 with respect to the total number (Z8) of elements contained in the phosphor is 0.02 or more.

4. The phosphor according to claim 2 , wherein

B 2 is one or more elements selected from the group consisting of Mg, Ca, Sr, and Ba,

C 2 is one or more elements selected from the group consisting of Al, Ga, In, Sc, and Y, and

X 2 is one or more halogen elements that include at least F.

5. The phosphor according to claim 2 , wherein

C 2 is one or more elements that include at least Al, and

the ratio (Z4/Z8) of the number (Z4) of Al elements contained as C 2 with respect to the total number (Z8) of elements contained in the phosphor is 0.01 or more.

6. A phosphor, comprising a crystal phase having a chemical composition represented by the following formula [3], the crystal phase having no garnet structure, and the phosphor having an emission peak in a wavelength range of 600 nm to 650 nm,

A 3 aiii B 3 biii C 3 ciii D 3 diii X 3 xiii Y 3 diii :R 3   formula [3],

wherein

A 3 represents one or more alkali metal elements,

B 3 represents one or more alkaline earth metal elements,

C 3 represents one or more elements selected from the group consisting of Group 3 elements and Group 13 elements of the periodic table,

D 3 represents one or more elements selected from the group consisting of Group 4 elements and Group 14 elements of the periodic table,

X 3 represents one or more halogen elements that include at least F,

Y 3 represents one or more Group 16 elements of the periodic table,

R 3 represents an element that includes at least a tetravalent Mn, and

aiii, biii, ciii, diii, and xiii each represent a number that satisfies

0.8≦aiii≦1.2,

0.8≦biii≦1.2,

0≦ciii≦1.2,

0≦diii≦1,

0.8≦ciii+diii≦1.2,

5.0≦xiii≦7.0,

and

5.0≦xiii+diii≦7.0.

7. The phosphor according to claim 6 , wherein

A 3 is one or more elements selected from the group consisting of Li, Na, K, Rb, and Cs,

B 3 is one or more elements selected from the group consisting of Mg, Ca, Sr, and Ba,

C 3 is one or more elements selected from the group consisting of Al, Ga, ln, Sc, and Y, and

X 3 is one or more halogen elements that include at least F.

8. The phosphor according to claim 6 , wherein

D 3 is one or more elements selected from the group consisting of Ti, Zr, Hf, Si, Ge, and Sn, and

Y 3 includes at least O.

9. The phosphor according to claim 6 , wherein the chemical composition represented by the formula [3]is represented by the following formula [4],

(A 4 aiv B 4 biv ,) 2 (C 4 civ D 4 div E 4 eiv ) 2 (x 4 xiv Y 4 yiv ) 7 :R 4   formula [4]

wherein

A 4 represents one or more alkali metal elements,

B 4 represents one or more alkaline earth metal elements,

C 4 represents one or more alkaline earth metal elements different from B 4 ,

D 4 represents one or more elements selected from the group consisting of Group 3 elements and Group 13 elements of the periodic table,

E 4 represents one or more elements selected from the group consisting of Group 4 elements and Group 14 elements of the periodic table,

X 4 represents one or more halogen elements that include at least F,

Y 4 represents one or more Group 16 elements of the periodic table,

R 4 represents an element that includes at least a tetravalent Mn, and

aiv, biv, civ, div, eiv, xiv, and yiv each represent a number that satisfies

0<aiv≦2.0,

0≦biv≦1.0,

0<aiv+biv≦2.5,

0<civ≦2.0,

0<div≦2.0,

0≦eiv≦1.0,

0.5≦civ+div+eiv≦2.5,

0<xiv≦2.0,

0≦yiv≦1.0,

and

0.5≦xiv+yiv≦2.5.

10. The phosphor according to claim 9 , wherein

A 4 is one or more elements selected from the group consisting of Li, Na, K, Rb, and Cs,

B 4 is an element that mainly includes one or more selected from the group consisting of Ca, Sr, and Ba,

C 4 is an element that mainly includes Mg,

D 4 is one or more elements selected from the group consisting of Al, Ga, In, Sc, and Y, and

X 4 is one or more halogen elements that include at least F.

11. The phosphor according to claim 9 , wherein C 4 is Mg.

12. The phosphor according to claim 9 , wherein

E 4 is one or more elements selected from the group consisting of Ti, Zr, Hf, Si, Ge, and Sn, and

Y 4 includes at least O.

13. The phosphor according to claim 9 , wherein the phosphor comprises a crystal phase having a pyrochlore structure.

14. A phosphor-containing composition, comprising

the phosphor of claim 1 , and

a liquid medium.

15. A light-emitting unit, comprising

a first illuminant, and

a second illuminant that emits visible light upon exposure to light from the first illuminant,

wherein the second illuminant comprises a first phosphor that includes one or more of the phosphor of claim 1 .

16. The light-emitting unit according to claim 15 , wherein the second illuminant comprises a second phosphor that includes one or more phosphors having an emission peak wavelength different from the emission peak wavelength of the first phosphor.

17. A lighting device, comprising the light-emitting unit of claim 15 .

18. An image display device, comprising the light-emitting unit of claim 15 .