Wavelength converted semiconductor light emitting device
AssigneeKoninklijke Philips N.V.
InventorsKenneth Vampola, Floris Crompvoets
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Abstract
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.
Claims20
A device comprising:
- a light emitting semiconductor structure comprising a light emitting layer;
- a reflective material disposed on and in contact with sidewalls of the light emitting semiconductor structure to define a first light extraction surface on the semiconductor structure, the first light extraction surface having a first area;
- a wavelength converting element disposed over the light emitting semiconductor structure and over the first light extraction surface;
- and
- a second light extraction surface on the wavelength converting element disposed over the first light extraction surface, the second light extraction surface having a second area, the second area being smaller than the first area.
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A device comprising:
- a plurality of light emitting semiconductor structures each having a light emitting layer and each surrounded by a reflective material to define a first light extraction surface on each semiconductor structure;
- and
- a wavelength converting element disposed over only a portion of at least two of the first light extraction surfaces, the wavelength converting element having a second light extraction surface;
- an area of the second light extraction surface is smaller than an area that is the sum of the areas of each of the first light extraction surfaces in the plurality and an area between the light emitting semiconductor structures in the plurality.
A device comprising:
- a semiconductor light emitting structure having a light emitting layer and having a first light extraction surface defined by reflective material disposed along sidewalls of the light emitting layer;
- a wavelength converting element disposed on the semiconductor light emitting structure and having the reflective material disposed along sidewalls of the wavelength converting layer to form a top surface of the wavelength converting layer having a substantially same area as the first light extraction surface;
- and
- a second structure disposed on the wavelength converting element above the first light extraction surface, the second structure having a second light extraction surface;
- and defined by the reflective material disposed along sidewalls of the second structure;
- an area of the second light extraction surface being less than an area of the first light extraction surface.
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Dependencies are inferred from the claim text.