Reflector packages and semiconductor light emitting devices including the same
View Patent ↗Reflectors for a semiconductor light emitting device include a lower sidewall portion defining a reflective cavity. A substantially horizontal shoulder portion extends outwardly from the sloped lower sidewall portion. The horizontal shoulder portion has a circumferentially extending moat formed therein. An upper sidewall portion extends upwardly from the horizontal shoulder portion.
1. A packaged semiconductor limit emitting device comprising:
a reflector having a lower sidewall portion defining a reflective cavity, a substantially horizontal shoulder portion extending outwardly from the lower sidewall portion, the horizontal shoulder portion having a circumferentially extending moat formed therein and an upper sidewall portion extending upwardly from the horizontal shoulder portion, wherein an edge of the moat is configured to limit wicking of encapsulant material outwardly along the horizontal shoulder portion to allow formation of a convex meniscus of encapsulant material dispensed into the reflective cavity;
a light emitting device positioned in the reflective cavity; and
an encapsulant material in the reflective cavity and covering the light emitting device.
2. A packaged semiconductor light emitting device comprising:
a reflector having a lower sidewall portion defining a reflective cavity, wherein the lower sidewall portion is sloped, a substantially horizontal shoulder portion extending outwardly from the lower sidewall portion, the horizontal shoulder portion having a circumferentially extending moat formed therein and an upper sidewall portion extending upwardly from the horizontal shoulder portion;
a light emitting device positioned in the reflective cavity; and
an encapsulant material in the reflective cavity and covering the light emitting device.
3. The device of claim 2 wherein the light emitting device comprises a light emitting diode (LED).
4. The device of claim 2 wherein the encapsulant material comprises a silicone gel.
5. The device of claim 2 wherein the encapsulant material includes a light converting material.
6. The device of claim 2 wherein the encapsulant material includes a first region displaced from the light emitting device that is substantially free of phosphor and a second region between the first region and the light emitting device that includes a phosphor.
7. The device of claim 6 wherein the device further comprises a lens attached to the first region of the encapsulant material and extending therefrom.
8. The device of claim 2 further comprising a lens extending from the encapsulant material over the light emitting device.
9. A reflector for a semiconductor light emitting device, comprising:
a lower sidewall portion defining a reflective cavity, wherein the lower sidewall portion is sloped;
a substantially horizontal shoulder portion extending outwardly from the sloped lower sidewall portion, the horizontal shoulder portion having a circumferentially extending moat formed therein; and
an upper sidewall portion extending upwardly from the horizontal shoulder portion.
10. The reflector of claim 9 wherein an edge of the moat is configured to limit wicking of encapsulant material outwardly along the horizontal shoulder portion to allow formation of a convex meniscus of encapsulant material dispensed into the reflective cavity.
11. The reflector of claim 10 wherein the edge of the moat comprises a lip.
12. The reflector of claim 10 wherein the lip has a peak having a radius of curvature of less than about 50 micrometers.
13. The reflector of claim 9 wherein the moat comprises a circumferentially extending inner moat positioned proximate the lower sidewall portion and a circumferentially extending outer moat positioned between the inner moat and the upper sidewall portion.
14. The reflector of claim 13 wherein an edge of the inner moat is configured to limit wicking of encapsulant material outwardly along the horizontal shoulder portion to allow formation of a first convex meniscus of encapsulant material dispensed into the reflective cavity and an edge of the outer moat is configured to limit wicking of encapsulant material outwardly along the horizontal shoulder portion to allow formation of a second convex meniscus of encapsulant material dispensed into the reflective cavity.
15. The reflector of claim 14 wherein the edge of the first moat comprises a first lip and wherein the edge of the second moat comprises a second lip.
16. The reflector of claim 14 wherein the first lip has a peak having a radius of curvature of less than about 50 micrometers and wherein the second lip has a peak having a radius of curvature of less than about 50 micrometers.
17. The reflector of claim 14 wherein the first moat and the second moat are stamped features of the horizontal shoulder portion.
18. The reflector of claim 14 wherein the second moat has a width extending from the second lip to the upper sidewall portion.
19. The reflector of claim 14 wherein the lower sidewall portion is substantially conical and has a minimum diameter of from about 1.9 millimeters (mm) to about 3.2 mm and a maximum diameter of from about 2.6 mm to about 4.5 mm and a height of from about 0.8 mm to about 1.0 mm.
20. The reflector of claim 19 wherein the upper sidewall portion is substantially oval and has an inner diameter of from about 3.4 millimeters (mm) to about 4.2 mm and a height of from about 0.6 mm to about 0.7 mm.
21. The reflector of claim 19 wherein the horizontal shoulder portion has a width from the lower sidewall portion to the upper sidewall portion of from about 0.4 mm to about 0.7 mm.
22. The reflector of claim 21 wherein the first moat has a width from about 0.3 millimeters (mm) to about 0.4 mm and wherein the second moat has a width of from about 0.3 mm to about 0.4 mm.
23. The reflector of claim 22 wherein the edge of the first moat comprises a first lip having a height relative to bottom end of the lower sidewall portion of from about 0.3 millimeters (mm) to about 0.4 mm and wherein the edge of the second moat comprises a second lip having a height relative to bottom end of the lower sidewall portion of from about 0.79 mm to about 0.85 mm.
24. The reflector of claim 22 wherein the edge of the first moat comprises a first lip having a height relative to bottom end of the lower sidewall portion of from about 0.79 millimeter (mm) to about 0.85 mm and wherein the edge of the second moat comprises a second lip having a height relative to bottom end of the lower sidewall portion of from about 0.9 mm to about 1.0 mm.