Light-emitting diode package with light-altering material
View Patent ↗Solid-state lighting devices including light-emitting diodes (LEDs) and more particularly packaged LEDs with light-altering materials are disclosed. A light-altering material is provided in particular configurations within an LED package to redirect light from an LED chip within the LED package and contribute to a desired emission pattern of the LED package. The light-altering material may also block light from the LED chip from escaping in a non-desirable direction, such as large or wide angle emissions. The light-altering material may be arranged on a lumiphoric material adjacent to the LED chip in various configurations. The LED package may include an encapsulant on the light-altering material and the lumiphoric material.
1. A light emitting diode (LED) package comprising:
a submount;
at least one LED chip on the submount, wherein the at least one LED chip comprises a first face mounted to the submount, a second face that generally opposes the first face, and a sidewall between the first face and the second face;
a lumiphoric material arranged on the sidewall and on at least a portion of the submount adjacent to the at least one LED chip; and
a light-altering material on the lumiphoric material and arranged around a perimeter of the at least one LED chip;
wherein the light-altering material is spaced from the lumiphoric material on the sidewall by a gap of at least 50 microns (μm).
2. The LED package of claim 1 , wherein the light-altering material is spaced from the lumiphoric material on the sidewall by a gap of at least 100 μm.
3. The LED package of claim 1 , wherein the light-altering material is spaced from the lumiphoric material on the sidewall by a gap in a range from 50 μm to 300 μm.
4. The LED package of claim 1 , further comprising an encapsulant on the lumiphoric material, the light-altering material, and in the gap.
5. The LED package of claim 4 , wherein the encapsulant forms a shape that includes a lens with a lens base and the light-altering material is registered with the lens base.
6. The LED package of claim 1 , wherein the at least one LED chip comprises a plurality of LED chips.
7. The LED package of claim 1 , wherein the light-altering material comprises a light-reflective material.
8. The LED package of claim 7 , wherein the light-reflective material comprises at least one of fused silica, fumed silica, or titanium dioxide (TiO 2 ) particles suspended in silicone.
9. The LED package of claim 1 , wherein the light-altering material comprises a light-absorbing material.
10. The LED package of claim 5 , wherein the light-altering material comprises:
an outer face and an inner face that generally opposes the outer face, wherein the outer face is aligned with the lens base.
11. The LED package of claim 5 , wherein the light-altering material comprises:
an outer face and an inner face that generally opposes the outer face, wherein the lens base is aligned between the outer face and the inner face.
12. The LED package of claim 5 , wherein the light-altering material comprises:
an outer face and an inner face that generally opposes the outer face, wherein the inner face is aligned with the lens base.
13. The LED package of claim 5 , wherein the lens comprises a hemispherical shape with a circular lens base.
14. The LED package of claim 5 , wherein the lens comprises a curved top surface and one or more planar side surfaces.
15. The LED package of claim 5 , wherein the lens comprises a planar top surface and one or more planar side surfaces.