Light-emitting device and manufacturing method thereof
View Patent ↗A light-emitting device includes a light-emitting element, a light pervious layer, an electrode defining layer, a first soldering pad and a second soldering pad. The light-emitting element has an upper surface, a bottom surface, and a lateral surface arranged between the upper surface and the bottom surface. The light pervious layer covers the upper surface and the lateral surface. The electrode defining layer covers a part of the light pervious layer. The first soldering pad and the second soldering pad are surrounded by the electrode defining layer. A gap is located between the first soldering pad and the second soldering pad while the gap remains substantially constant.
1. A light-emitting device, comprising:
a light-emitting element, comprising a first conductive pad, a second conductive pad, an upper surface, a bottom surface, and a lateral surface arranged between the upper surface and bottom surface;
a light pervious layer, covering the upper surface and the lateral surface to expose the bottom surface;
an electrode defining layer, fully arranged under the light pervious layer, and comprising a first recess exposing the first conductive pad, a second recess exposing the second conductive pad and having a different shape from the first recess, and a portion having a curved bottom surface and arranged between the first recess and the second recess;
a first soldering pad with a melting temperature not greater than 280° C., filled in the first recess in a configuration of directly contacting the first conductive pad and the electrode defining layer residing aside the electrode defining layer, and surrounded by the electrode defining layer; and
a second soldering pad, filled in the second recess, and surrounded by the electrode defining layer,
wherein the first recess has a first edge, and the second recess has a second edge substantially parallel to the first edge, and the electrode defining layer comprises a first surface and the first soldering pad comprises a second surface, and the first surface is separated from the second surface by a vertical distance of not greater than 10 μm.
2. The light-emitting device according to claim 1 , further comprising a gap which is arranged between the first recess and the second recess, and is not greater than 40 μm.
3. The light-emitting device according to claim 1 , wherein the first conductive pad and the second conductive pad are disposed on a same side of the light-emitting element.
4. The light-emitting device according to claim 1 , wherein the first soldering pad is physically and electrically connected to the first conductive pad, the second soldering pad is physically and electrically connected to the second conductive pad.
5. The light-emitting device according to claim 1 , wherein the first soldering pad has a first projected area, and the first conductive pad has a second projected area, and a ratio of the first projected area to the second area is not less than 0.9.
6. The light-emitting device according to claim 1 , wherein the light pervious layer comprising a wavelength conversion layer and a light-adjusting layer.
7. The light-emitting device according to claim 1 , wherein the light pervious layer includes a wavelength conversion layer and a light-adjusting layer, the light-adjusting layer comprises a plurality of light-diffusing particles.
8. The light-emitting device according to claim 1 , wherein the first recess has a shape same as that of the first soldering pad.
9. The light-emitting device according to claim 1 , wherein the electrode defining layer comprises a step structure.
10. The light-emitting device according to claim 1 , wherein the electrode defining layer comprises a transparent binder and a plurality of light-reflecting particles dispersed in the transparent binder.
11. The light-emitting device according to claim 1 , wherein the first soldering pad includes an area expanded outward from the light-emitting element.
12. The light-emitting device according to claim 1 , wherein the first soldering pad, the second soldering pad, or both comprise one corner.
13. The light-emitting device according to claim 1 , wherein the second soldering pad has a melting temperature not greater than 280° C.
14. The light-emitting device according to claim 1 , wherein the first soldering pad comprises a first tin alloy and a second tin alloy, and the first tin alloy has a melting temperature higher than that of the second tin alloy.
15. The light-emitting device according to claim 14 , wherein the second tin alloy is closer to the light-emitting element than the first tin alloy.
16. The light-emitting device according to claim 1 , wherein the first soldering pad comprises Sn/Sb alloy.
17. The light-emitting device according to claim 1 , further comprising a thin metal layer arranged between the electrode defining layer and the first soldering pad.
18. The light-emitting device according to claim 1 , wherein the first recess has a plurality of first corners, and the second recess has a plurality of second corners, the first corners and the second corners have different quantities.