Light emitting device with an adhered heat-dissipating structure
This disclosure discloses a light-emitting device. The light-emitting device includes: a heat-dissipating structure having a first part and a second part separated from the first part; a light-emitting unit including a light-emitting element with a first pad formed on the first part; and a first transparent enclosing the light-emitting element and having a sidewall; and an adhesive material covering a portion of the sidewall.
1. A light-emitting device comprising:
a light-emitting element with an electrode and a first pad extending from the electrode;
a first transparent structure enclosing the light-emitting element and having a sidewall, a top surface, and a bottom surface opposite to the top surface;
an insulating reflective layer formed on the bottom surface, and having a flat surface contacting the bottom surface, a curved surface contacting the first pad, wherein the insulating reflective layer extends from the electrode toward the sidewall, and has a portion with a height gradually increasing in a direction to the sidewall;
a heat-dissipating structure under the light-emitting element; and
an adhesive material covering the heat-dissipating structure and only a portion of the sidewall.
2. The light-emitting device of claim 1 , wherein the heat-dissipating structure has a first part and a second part separated from the first part, and a metal layer formed on the first part and having an area two times larger than that of the first pad.
3. The light-emitting device of claim 2 , wherein the adhesive material between the first part and the second part has a lower surface coplanar with a bottom surface of the first part.
4. The light-emitting device of claim 1 , wherein the light-emitting element further has a second pad separated from the first pad, and the adhesive material is further formed between the first pad and the second pad.
5. The light-emitting device of claim 2 , wherein the insulating reflective layer is overlapped by the metal layer in a cross sectional view.
6. The light-emitting device of claim 1 , wherein the adhesive material includes an insulation material.
7. The light-emitting device of claim 1 , wherein the adhesive material covers a bottom surface of the light-emitting element.
8. The light-emitting device of claim 1 , wherein the light-emitting device further comprises a second transparent structure formed on the first transparent structure.
9. The light-emitting device of claim 1 , wherein the top surface of the first transparent structure is exposed to air.
10. The light-emitting device of claim 2 , wherein the adhesive material is filled within a space between the first part and the second part.
11. The light-emitting device of claim 1 , wherein the first part of the heat-dissipating structure has a top portion and a side portion which are covered by the adhesive material.
12. The light-emitting device of claim 2 , wherein a part of a top portion of the first part of the heat-dissipating structure that does not overlap with the light-emitting element is entirely covered by the adhesive material.
13. The light-emitting device of claim 2 , wherein the adhesive material has a three-sided shape in the cross sectional view, two of three sides of the three-sided shape contact the first part of the heat-dissipating structure and the side wall of the first transparent structure, respectively.