Luminescent ceramic for a light emitting device

摘要

A semiconductor light emitting device comprising a light emitting layer disposed between an n-type region and a p-type region is combined with a ceramic layer which is disposed in a path of light emitted by the light emitting layer. The ceramic layer is composed of or includes a wavelength converting material such as a phosphor. Luminescent ceramic layers according to embodiments of the invention may be more robust and less sensitive to temperature than prior art phosphor layers. In addition, luminescent ceramics may exhibit less scattering and may therefore increase the conversion efficiency over prior art phosphor layers.

主权项

1. A device comprising:
a light emitting structure comprising a light emitting layer; a first ceramic phosphor disposed in a path of light emitted by the light emitting layer; a second ceramic phosphor disposed in a path of light emitted by the light emitting layer; and a heat extraction structure; wherein:
one of the first ceramic phosphor and the second ceramic phosphor is directly connected to the heat extraction structure;a surface of the first ceramic phosphor is roughened;one of the first ceramic phosphor and the second ceramic phosphor is a transparent or translucent ceramic slab formed by sintering;the light emitting structure is disposed between a mount and the first ceramic phosphor and directly connected to the mount; andthe heat extraction structure is disposed between the mount and the first ceramic phosphor and directly connected to the mount.