Light-emitting element and the manufacturing method thereof
A light-emitting element having a light-emitting unit, a transparent layer and a wavelength conversion layer formed on the transparent layer. The transparent layer covers the light-emitting unit. The wavelength conversion layer includes a phosphor layer having a phosphor and a stress release layer without the phosphor.
1. A light-emitting element, comprising:
a light-emitting unit having a top surface, a bottom surface opposite to the top surface and a side surface between the top surface and the bottom surface;
a wavelength conversion layer covering the top surface, the wavelength conversion layer comprising a phosphor layer having a phosphor and a stress release layer without the phosphor formed on the phosphor layer;
a first transparent bottom layer arranged between the light-emitting unit and the wavelength conversion layer;
a transparent layer arranged on the top surface, and covering the wavelength conversion layer;
a protection layer covering the side surface and partially covering the transparent layer without covering the top surface and the bottom surface; and
a first conductive layer arranged under the bottom surface,
wherein the phosphor layer has an first open end and a second open end in a cross sectional view, the first open end and second open end being exposed by the first transparent bottom layer and the stress release layer,
wherein the stress release layer has a third open end in a cross sectional view, the third open end being exposed by the phosphor layer and the transparent layer,
wherein the first conductive layer seals the first open end and a bottom of the third open end without directly contacting the second open end and the protection layer seals a side of the third open end.
2. The light-emitting element according to claim 1 , further comprising a second transparent bottom layer arranged between the light-emitting unit and the wavelength conversion layer.
3. The light-emitting element according to claim 2 , wherein the first transparent bottom layer and the second transparent bottom layer comprise a common material.
4. The light-emitting element according to claim 1 , further comprising a carrier formed on the transparent layer.
5. The light-emitting element according to claim 4 , wherein the protection layer covers a sidewall of the transparent layer and a sidewall of the carrier.
6. The light-emitting element according to claim 4 , wherein the protection layer comprises a top surface being coplanar with a top surface of the carrier.
7. The light-emitting element according to claim 1 , wherein the protection layer and the light-emitting unit are overlapped with each other in a horizontal direction.
8. The light-emitting element according to claim 2 , wherein the first transparent bottom layer totally separates the wavelength conversion layer and the light-emitting unit.
9. The light-emitting element according to claim 2 , wherein the first transparent bottom comprises a curved surface contacting the wavelength conversion layer.
10. The light-emitting element according to claim 2 , wherein the first transparent bottom layer contacting the top surface and the side surface of the light-emitting unit.
11. The light-emitting element according to claim 9 , wherein the wavelength conversion layer and the curved surface have an identical contour.
12. The light-emitting element according to claim 2 , wherein the first conductive layer contacts the first open end and the first transparent bottom layer.
13. The light-emitting element according to claim 1 , further comprises a second conductive layer which is separated from the first conductive layer, and arranged under the bottom surface for sealing the second open end.