Light-emitting device
A light-emitting device includes a substrate, a first light-emitting element mounted on the substrate, an annular transparent dam formed on the substrate so as to surround the first light-emitting element, a second light-emitting element that is mounted on the substrate so as to be embedded in an interior of the dam and that has a shorter peak emission wavelength than that of the first light-emitting element, and a sealing material filled inside the dam so as to seal the first light-emitting element.
1. A light-emitting device, comprising:
a substrate;
a first light-emitting element in direct contact with a surface of the substrate;
an annular transparent dam formed on the substrate so as to surround the first light-emitting element;
an insulation layer in direct contact with the surface of the substrate;
a second light-emitting element that is mounted on the substrate so as to be embedded in an interior of the dam and that has a shorter peak emission wavelength than that of the first light-emitting element, the second light-emitting element in direct contact with a top surface of the insulation layer; and
a sealing material filled inside the dam so as to seal the first light-emitting element.
2. The light-emitting device according to claim 1 , wherein the second light-emitting element emits a violet light.
3. The light-emitting device according to claim 1 , wherein the dam does not include a phosphor.
4. The light-emitting device according to claim 1 , wherein the sealing material includes a phosphor, and
wherein the peak emission wavelength of the second light-emitting element is outside a wavelength range of an absorption spectrum of the phosphor included in the sealing material.
5. The light-emitting device according to claim 1 , wherein the dam comprises a filler.
6. The light-emitting device according to claim 1 , wherein the first light-emitting element is disposed on an upper surface of the substrate.
7. The light-emitting device according to claim 6 , wherein the insulation layer is disposed on the upper surface of the substrate.
8. The light-emitting device according to claim 1 , wherein the insulation layer comprises an insulating material including one of a glass epoxy and polyimide.
9. The light-emitting device according to claim 8 , wherein the substrate comprises an aluminum substrate including an aluminum anodic oxide film on a surface thereof.
10. The light-emitting device according to claim 9 , wherein the dam comprises one of a silicone-based resin and an epoxy-based resin.
11. The light-emitting device according to claim 10 , wherein the sealing material comprises one of a silicone-based resin and an epoxy-based resin.
12. The light-emitting device according to claim 1 , wherein the substrate includes wire bonding terminals exposed inside of the dam and external connecting terminals disposed outside of the dam.
13. The light-emitting device according to claim 12 , wherein the wire bonding terminals and the external connecting terminals are connected through wiring electrodes arranged under the insulation layer.
14. The light-emitting device according to claim 13 , further comprising an external power supply connected to the external connecting terminals.
15. The light-emitting device according to claim 1 , wherein an upper surface of the substrate excluding a region inside of the dam is covered with the insulation layer.
16. A light-emitting device, comprising:
a substrate;
an insulation layer in direct contact with a surface of the substrate;
a first light-emitting element in direct contact with the surface of the substrate;
a transparent dam disposed on the surface of the substrate to surround the first light-emitting element;
a second light-emitting element in direct contact with a top surface of the insulation layer, the second light-emitting element being embedded in an interior of the dam and has a shorter peak emission wavelength than that of the first light-emitting element; and
a sealing material that seals the first light-emitting element.
17. The light-emitting device according to claim 16 , wherein the substrate includes wire bonding terminals exposed inside of the dam and external connecting terminals disposed outside of the dam.
18. The light-emitting device according to claim 17 , wherein the wire bonding terminals and the external connecting terminals are connected through wiring electrodes arranged under the insulation layer.
19. The light-emitting device according to claim 18 , further comprising an external power supply connected to the external connecting terminals.
20. The light-emitting device according to claim 16 , wherein the surface of the substrate excluding a region inside of the dam is covered with the insulation layer.