Batwing LED with remote phosphor configuration
View Patent ↗A lens is formed over one or more light-emitting devices disposed over a substrate. The lens includes a trench that circumferentially surrounds the one or more light-emitting devices. The trench is filled with a phosphor-containing material.
1. A lighting device, comprising:
a first LED die comprising a upper surface, a lower surface, and a side surface arranged between the upper surface and the lower surface;
a phosphor surrounding the side surface;
a transparent material devoid of the phosphor, and covering the side surface and the upper surface; and
a light-reflective element arranged on the transparent material and having an outer thickness and a central thickness greater than the outer thickness,
wherein the light-reflective element covers only a portion of a top surface of the transparent material.
2. The lighting device of claim 1 , wherein the light-reflective element comprises a convex portion and a plane opposite to the convex portion.
3. The lighting device of claim 1 , wherein the light-reflective element directly contacts the transparent material.
4. The lighting device of claim 1 , wherein the light-reflective element comprises a metal or a metal oxide.
5. The lighting device of claim 1 , wherein the transparent material has a top contour substantially corresponding to a bottom contour of the light-reflective material.
6. The lighting device of claim 1 , wherein the transparent material has a ring shape in a top sectional view of the lighting device.
7. The lighting device of claim 1 , wherein the transparent material comprises a trench.
8. The lighting device of claim 1 , wherein the phosphor is separated from the first LED die by the transparent material.
9. The lighting device of claim 1 , wherein the phosphor is directly connected to the transparent material.
10. The lighting device of claim 1 , wherein the phosphor has a tubular shape.
11. The lighting device of claim 1 , further comprising a second LED die near the first LED die.
12. The lighting device of claim 11 , wherein the light-reflective element comprises a convex portion corresponding to a position between the first LED die and the second LED die.
13. The lighting device of claim 11 , wherein the first LED die and the second LED die are electrically connected in series.
14. The lighting device of claim 7 , wherein the trench has a close loop configuration surrounding the first LED die.
15. The lighting device of claim 1 , wherein the phosphor has a layer having a first height smaller than a maximum thickness of the transparent material in a sectional view.
16. The lighting device of claim 1 , wherein the first LED die and the light-reflective element are not overlapped with each other in a top view.
17. A lighting device, comprising:
a first LED die comprising a upper surface, a lower surface, and a side surface arranged between the upper surface and the lower surface;
a phosphor surrounding the side surface;
an transparent material covering the side surface and the upper surface;
a light-reflective element arranged on the transparent material, and having an outer thickness and a central thickness greater than the outer thickness,
wherein the light-reflective element covers only a portion of a top surface of the transparent material.
18. A lighting device, comprising:
a first LED die comprising a upper surface, a lower surface, and a side surface arranged between the upper surface and the lower surface;
a phosphor surrounding the side surface;
an transparent material covering the side surface and the upper surface;
a light-reflective element arranged on the transparent material, having an outer thickness and a central thickness greater than the outer thickness, and having a top plane substantially parallel to the upper surface.