Wavelength converted semiconductor light emitting device
In some embodiments of the invention, a device includes a semiconductor light emitting device having a first light extraction surface, a wavelength converting element, and a second light extraction surface. A majority of light extracted from the semiconductor light emitting device is extracted from the first light extraction surface. The first light extraction surface has a first area. The second light extraction surface is disposed over the first light extraction surface and has a second area. The first area is larger than the second area.
1. A device comprising:
a light emitting device having a first light extraction surface extending from one sidewall of the light emitting device to another sidewall of the light emitting device, the first light extraction surface having a first area, and a majority of light extracted from the light emitting device is extracted from the first light extraction surface, and
a wavelength converting element disposed over the first light extraction surface and having a bottom surface at least partially contacting the first light extraction surface, the wavelength converting element having a second light extraction surface opposite the bottom surface and disposed over the first light extraction surface, the second light extraction surface having a second area smaller than the first area of the first light extraction surface, and the bottom surface having a third area that is equal to the first area of the first light extraction surface and having a width equal to a maximum width of the wavelength converting element.
2. The device of claim 1 , further comprising a reflective material disposed along sidewalls of the wavelength converting element,
wherein the second light extraction surface is level with a surface of the reflective material.
3. The device of claim 1 , wherein the second area of the second light extraction surface is 30% to 60% of the first area.
4. The device of claim 1 , wherein the second light extraction surface has a shape of a circle.
5. The device of claim 4 , wherein a hole is formed in a center of the second light extraction surface that extends through an entire thickness of the wavelength converting element and exposes the first light extraction surface.
6. The device of claim 1 , wherein the second light extraction surface has a shape of a parallelogram.
7. The device of claim 5 , wherein the parallelogram is a square or a trapezoid.
8. The device of claim 1 , wherein the second light extraction surface extends past at least one side of the first light extraction surface.
9. The device of claim 1 , wherein a center of the second light extraction surface is not aligned with a center of the first light extraction surface.
10. The device of claim 1 , wherein a first edge of the second light extraction surface aligns with a first edge of the first light extraction surface.
11. The device of claim 10 , wherein a second edge of the second light extraction surface aligns with a second edge of the second light extraction surface.
12. The device of claim 1 , wherein the wavelength converting element has a top portion comprising the second light extraction surface and a bottom portion comprising the bottom surface, the top portion comprising first sidewalls that are perpendicular to the second light extraction surface and the bottom portion comprising second sidewalls that are angled with respect to the first sidewalls.
13. The device of claim 1 , further comprising a transparent structure disposed over the second light extraction surface.
14. The device of claim 1 , wherein the wavelength converting element has angled sidewalls extending in a straight line from the bottom surface to the second light extraction surface.
15. The device of claim 2 , wherein the reflective material comprises particles of TiO x disposed in a silicone.
16. The device of claim 2 , wherein the reflective material is at least one of silver, aluminum, gold, and a distributed Bragg reflector.
17. A device comprising:
a light emitting device having a first light extraction surface extending from one sidewall of the light emitting device to another sidewall of the light emitting device, the first light extraction surface having a first area, and a majority of light extracted from the light emitting device is extracted from the first light extraction surface, and
a wavelength converting element disposed over the first light extraction surface and having a bottom surface at least partially contacting the first light extraction surface and a second light extraction surface opposite the bottom surface and disposed over the first light extraction surface, the second light extraction surface having a second area smaller than the first area of the first light extraction surface, the bottom surface having a third area that is less than the first area of the first light extraction surface, and the wavelength converting element having a smaller maximum width parallel to the bottom surface than a maximum width of the light emitting device parallel to the bottom surface and having sidewalls that are perpendicular to the bottom surface.
18. The device of claim 17 , wherein the second area of the second light extraction surface is a same size as the third area of the bottom surface.
19. A device comprising:
a light emitting device having a first light extraction surface extending from one sidewall of the light emitting device to another sidewall of the light emitting device, the first light extraction surface having a first area, and a majority of light extracted from the light emitting device is extracted from the first light extraction surface, and
a wavelength converting element disposed over the first light extraction surface and having a bottom surface at least partially contacting the first light extraction surface and a second light extraction surface opposite the bottom surface and disposed over the first light extraction surface, the second light extraction surface having a second area smaller than the first area of the first light extraction surface, the bottom surface having a third area that is less than the first area of the first light extraction surface,
the wavelength converting element having a top portion comprising the second light extraction surface and a bottom portion comprising the bottom surface, the top portion comprising first sidewalls that are perpendicular to the second light extraction surface and the bottom portion comprising second sidewalls that are perpendicular to the bottom surface, and the top portion having a smaller maximum width parallel to the bottom surface than a maximum width of the bottom portion parallel to the bottom surface.