Sintered phosphor, light emitting device, illumination device, vehicle headlamp, and method for manufacturing sintered phosphor

1. A sintered phosphor-composite, comprising:

a nitride phosphor; and

a fluoride inorganic binder that is a cubic crystal,

wherein the sintered phosphor-composite is a plate-like sintered phosphor-composite, and the plate-like sintered phosphor-composite has a thickness of 50 μm or more and 2000 μm or less.

2. The sintered phosphor-composite according to claim 1 , wherein the sintered phosphor-composite has a transmittance of 20% or more at a wavelength of 700 nm, and the sintered phosphor-composite has an internal quantum efficiency of 60% or more when being excited by blue light having a wavelength of 450 nm.

3. A light-emitting apparatus, comprising:

the sintered phosphor-composite according to claim 1 ; and

an LED or a semiconductor laser as a light source,

wherein the sintered phosphor-composite absorbs at least part of light from the light source and emits light having a different wavelength.

4. An illumination apparatus comprising the light-emitting apparatus according to claim 3 .

5. A vehicular headlamp comprising the light-emitting apparatus according to claim 3 .

6. A method for producing the sintered phosphor-composite of claim 1 , the method comprising:

mixing a nitride phosphor and a fluoride inorganic binder, to obtain a mixture; and

sintering the mixture at a temperature of 400° C. or more and 1500° C. or less.

7. The sintered phosphor-composite according to claim 1 , further comprising:

a garnet-based phosphor that emits yellow or green light;

wherein the nitride phosphor emits red light.

8. The sintered phosphor-composite according to claim 7 , wherein the garnet phosphor that emits yellow or green light comprises at least one of garnet phosphor elected from the group consisting of a YAG phosphor represented by the following general formula (1), a GYAG phosphor represented by the general formula (2), an LuAG phosphor represented by the general formula (3), and a phosphor represented by the general formula (4):

Y a (Tb,Lu) b (Ga,Sc) c Al d O e :Ce  (1)

(a+b=3, 0≤b≤0.2, 4.5≤c+d≤5.5, 0≤c≤0.2, and 10.8≤e≤s 13.4 in the formula (1));

Y a (Tb,Gd,Lu) b (Ga,Sc) c Al d O e :Ce  (2)

(a+b=3, 0≤b≤0.2, 4.5≤c+d≤5.5, 1.2≤c≤2.6, and 10.8≤e≤13.4 in the formula (2));

Lu a (Tb,Gd,Y) b (Ga,Sc) c Al d O e :Ce  (3)

(a+b=3, 0≤c≤0.2, 4.5≤c+d≤5.5, 0≤d≤0.2, and 10.8≤e≤13.4 in the formula (3)); and

Y a Tb f (Gd,Lu) b (Ga,Sc) c Al d O e :Ce  (4)

(a+b+f=3, 0≤b≤0.2, 4.5≤c+d≤5.5, 0≤c≤2.6, 10.8≤e≤13.4, and 0.1≤f≤1 in the formula (4)).

9. The sintered phosphor-composite according to claim 7 , wherein the nitride phosphor that emits red light comprises at least one of nitride phosphors selected from the group consisting of CASN represented by the following general formula: CaAlSiN 3 :Eu, SCASN represented by the following general formulae: (Ca, Sr, Ba, Mg)AlSiN 3 :Eu and/or (Ca, Sr, Ba)AlSiN 3−x O x :Eu (0<x<3 in the formula), and Sr 2 Si 5 N 8 represented by the following general formula: (Sr, Ca, Ba) 2 Al x Si 5−x O x N 8−x :Eu (0≤x≤2 in the formula).

10. The sintered phosphor-composite according to claim 1 , wherein the nitride phosphor comprises at least one selected from the group consisting of

CASN represented by the following general formula: CaAlSiN 3 :Eu,

SCASN represented by the following general formulae: (Ca, Sr, Ba, Mg)AlSiN 3 :Eu and/or (Ca, Sr, Ba)AlSiN 3−x O x :Eu (0<x<3 in the formula),

Sr 2 Si 5 N 8 represented by the following general formula: (Sr, Ca, Ba) 2 Al x Si 5−x O x N 8−x :Eu (0≤x≤2 in the formula),

LSN represented by the following general formula: Ln x Si y N n :Z (wherein Ln is a rare-earth element except an element used as an activator; Z is the activator; and 2.7≤x≤3.3, 5.4≤y≤56.6, and 10≤n≤12 are satisfied), and

β-sialon represented by the following general formula: Si 6−z Al z O x N 8−z :Eu (0<z<4.2 in the formula).