Light emitting device
View Patent ↗According to one embodiment, a light emitting device includes a base, a light emitting element, and a fluorescent body-containing layer. The light emitting element is installed on the base, has an upper surface and a lower surface, and includes a light emitting unit on the upper surface. The fluorescent body-containing layer is provided on the light emitting element and has a lower surface having an area smaller than an area of the light emitting unit and an upper surface having an area larger than an area of the light emitting unit.
1. A light emitting device comprising:
a base having a recess;
a light emitting element installed on the base, the light emitting element having an upper surface and a lower surface, the light emitting element including a light emitting unit on the upper surface; and
a fluorescent body-containing layer provided on the light emitting element the fluorescent body-containing layer having a lower surface, the lower surface having an area smaller than an area of the light emitting unit the fluorescent body-containing layer having an upper surface, the upper surface having an area larger than the area of the light emitting unit, the fluorescent body-containing layer being provided in the recess of the base.
2. The light emitting device according to claim 1 , wherein an upper surface of the fluorescent body-containing layer is covered with a transparent resin layer.
3. The light emitting device according to claim 1 , wherein the fluorescent body-containing layer and the light emitting element are apart.
4. The light emitting device according to claim 1 , wherein
an area of the lower surface of the fluorescent body-containing layer is not less than 70% and not more than 80% of an area of the light emitting unit and
an area of the upper surface of the fluorescent body-containing layer is not less than 110% and not more than 160% of an area of the light emitting unit.
5. The light emitting device according to claim 1 , wherein
an area of the upper surface of the fluorescent body-containing layer is not less than 110% and not more than 180% of an area of the light emitting unit and
an angle between a side surface of the fluorescent body-containing layer and the light emitting unit is not less than 30 degrees and not more than 40 degrees.
6. The light emitting device according to claim 1 , wherein
the light emitting element is provided in the recess,
the light emitting device further includes a transparent resin layer provided in the recess and being in contact with a side surface of the fluorescent body-containing layer, and
light emitted from the light emitting unit is allowed to reach a surface of the transparent resin layer without passing through the fluorescent body-containing layer.
7. The light emitting device according to claim 6 , wherein heights of the transparent resin layer and the fluorescent body-containing layer from a bottom of the base are same.
8. The light emitting device according to claim 6 , wherein an upper surface of the fluorescent body-containing layer is covered with the transparent resin layer.
9. The light emitting device according to claim 6 , further comprising a reflection layer between the base and the transparent resin layer.
10. The light emitting device according to claim 9 , wherein the reflection layer is in contact with a side surface of the light emitting element.
11. The light emitting device according to claim 10 , wherein a filler material is dispersed in the reflection layer.
12. The light emitting device according to claim 1 , wherein
the light emitting element is provided in the recess,
the light emitting device further includes a transparent resin layer provided in the recess and being in contact with a side surface of the fluorescent body-containing layer,
the fluorescent body-containing layer is provided on a part of the light emitting unit of the light emitting element, and
the transparent resin layer is in contact with the part of the light emitting unit.
13. The light emitting device according to claim 12 , wherein heights of the transparent resin layer and the fluorescent body-containing layer from a bottom of the base are same.
14. The light emitting device according to claim 1 , wherein
the light emitting element is provided in the recess, and
the fluorescent body-containing layer is a part of a transparent resin layer provided in the recess.
15. The light emitting device according to claim 14 , wherein light emitted from the light emitting unit is allowed to reach a surface of the transparent resin layer other than the fluorescent body-containing layer without passing through the fluorescent body-containing layer.
16. The light emitting device according to claim 14 , wherein the fluorescent body-containing layer is provided on a part of the light emitting unit of the light emitting element.
17. A light emitting device comprising:
a base;
a light emitting element installed on the base, the light emitting element having an upper surface and a lower surface, the light emitting element including a light emitting unit on the upper surface;
a fluorescent body-containing layer provided on the light emitting element, the fluorescent body-containing layer having a lower surface, the lower surface having an area smaller than an area of the light emitting unit, the fluorescent body-containing layer having an upper surface, the upper surface having an area larger than the area of the light emitting unit; and
a lens layer covering the light emitting element and the fluorescent body-containing layer,
light emitted from the light emitting unit being allowed to reach a surface of the lens layer without passing through the fluorescent body-containing layer.
18. The light emitting device according to claim 17 , wherein the fluorescent body-containing layer and the light emitting element are apart.
19. A light emitting device comprising:
a base;
a light emitting element installed on the base, the light emitting element having an upper surface and a lower surface, the light emitting element including a light emitting unit on the upper surface;
a fluorescent body-containing layer provided on the light emitting element, the fluorescent body-containing layer having a lower surface, the lower surface having an area smaller than an area of the light emitting unit, the fluorescent body-containing layer having an upper surface, the upper surface having an area larger than the area of the light emitting unit; and
a lens layer covering the light emitting element and the fluorescent body-containing layer,
the fluorescent body-containing layer being provided on a part of the light emitting unit of the light emitting element,
the lens layer being in contact with the part of the light emitting unit,
the fluorescent body-containing layer and the light emitting element being apart.