Wavelength conversion element, light source device, and projector
The wavelength conversion element includes a phosphor layer having a plurality of phosphor particles and a binder configured to bind one of the phosphor particles adjacent to each other and another of the phosphor particles adjacent to each other out of the plurality of phosphor particles, an antireflection layer disposed on an incident side of the excitation light with respect to the phosphor layer, and a substrate provided with the phosphor layer, wherein the binder includes glass, and the binder binds a part of a surface of the one of the phosphor particles and a part of a surface of the another of the phosphor particles to each other.
1. A wavelength conversion element comprising:
a phosphor layer having a plurality of phosphor particles and a binder that binds one of the phosphor particles adjacent to another one of the phosphor particles;
an antireflection layer on a side of the phosphor layer where excitation light is incident; and
a substrate provided with the phosphor layer, wherein
the binder includes glass,
the binder binds a part of a surface of the one of the phosphor particles and a part of a surface of the other one of the phosphor particles to each other, and
each of the one of the phosphor particles and the other one of the phosphor particles has part of the surface which is not bound to the binder.
2. The wavelength conversion element according to claim 1 , wherein
a proportion of a volume of the binder to a total volume of a sum of volumes of the phosphor particles and a sum of volumes of the binder is larger than 0 vol % and no larger than 10 vol %.
3. A light source device comprising:
the wavelength conversion element according to claim 2 ; and
a light source configured to emit excitation light to the wavelength conversion element.
4. A projector comprising:
the light source device according to claim 3 ;
a light modulation device configured to modulate light emitted from the light source device in accordance with image information; and
a projection optical device configured to project the light modulated by the light modulation device.
5. A light source device comprising:
the wavelength conversion element according to claim 1 ; and
a light source configured to emit excitation light to the wavelength conversion element.
6. A projector comprising:
the light source device according to claim 5 ;
a light modulation device configured to modulate light emitted from the light source device in accordance with image information; and
a projection optical device configured to project the light modulated by the light modulation device.
7. The wavelength conversion element according to claim 1 , wherein
each of the one of the phosphor particles and the other one of the phosphor particles has part of the surface which is not bound to the binder due to voids in the binder.
8. A wavelength conversion element comprising:
a phosphor layer having a plurality of phosphor particles, a binder, and a respective antireflection layer on a surface of each of the plurality of phosphor particles; and
a substrate provided with the phosphor layer, wherein
the binder includes glass,
the binder binds a part of the antireflection layer on the surface of one of the phosphor particles and a part of the antireflection layer on the surface of the other of the phosphor particles to each other, and
each of the one of the phosphor particles and the other one of the phosphor particles has part of the surface which is not bound to the binder.
9. The wavelength conversion element according to claim 8 , wherein
a proportion of a volume of the binder to a total volume of a sum of volumes of the phosphor particles and a sum of volumes of the binder is larger than 0 vol % and no larger than 10 vol %.
10. A light source device comprising:
the wavelength conversion element according to claim 9 ; and
a light source configured to emit excitation light to the wavelength conversion element.
11. A projector comprising:
the light source device according to claim 10 ;
a light modulation device configured to modulate light emitted from the light source device in accordance with image information; and
a projection optical device configured to project the light modulated by the light modulation device.
12. A light source device comprising:
the wavelength conversion element according to claim 8 ; and
a light source configured to emit excitation light to the wavelength conversion element.
13. A projector comprising:
the light source device according to claim 12 ;
a light modulation device configured to modulate light emitted from the light source device in accordance with image information; and
a projection optical device configured to project the light modulated by the light modulation device.
14. The wavelength conversion element according to claim 8 , wherein
each of the one of the phosphor particles and the other one of the phosphor particles has part of the surface which is not bound to the binder due to voids in the binder.
15. A wavelength conversion element comprising:
a phosphor layer having a plurality of phosphor particles, a binder, and a respective antireflection layer on a surface of each of the plurality of phosphor particles; and
a substrate provided with the phosphor layer, wherein
the binder includes glass,
the binder binds a part of the surface of a first one of the phosphor particles and a part of the antireflection layer on the surface of a second one of the phosphor particles to each other, and
each of the first one of the phosphor particles and the second one of the phosphor particles has part of the surface which is not bound to the binder.
16. The wavelength conversion element according to claim 15 , wherein
the binder binds a part of the surface of a third one of the phosphor particles and a part of the surface of a fourth one of the phosphor particles to each other, and
each of the third one of the phosphor particles and the fourth one of the phosphor particles has part of the surface which is not bound to the binder.
17. The wavelength conversion element according to claim 15 , wherein
each of the one of the phosphor particles and the other one of the phosphor particles has part of the surface which is not bound to the binder due to voids in the binder.
18. A light source device comprising:
the wavelength conversion element according to claim 15 ; and
a light source configured to emit excitation light to the wavelength conversion element.
19. A projector comprising:
the light source device according to claim 18 ;
a light modulation device configured to modulate light emitted from the light source device in accordance with image information; and
a projection optical device configured to project the light modulated by the light modulation device.