US Patent No. 9,359,260

LUMINESCENT CERAMIC FOR A LIGHT EMITTING DEVICE


Patent No. 9,359,260
Issue Date June 07, 2016
Title Luminescent Ceramic For A Light Emitting Device
Inventorship Gerd O. Mueller, San Jose, CA (US)
Regina B. Mueller-Mach, San Jose, CA (US)
Michael R. Krames, Los Altos, CA (US)
Peter J. Schmidt, Aachen (DE)
Hans-Helmut Bechtel, Aachen (DE)
Joerg Meyer, Aachen (DE)
Jan de Graaf, Eindhoven (NL)
Theo Arnold Kop, Eindhoven (NL)
Assignee Lumileds LLC, San Jose, CA (US)

Claim of US Patent No. 9,359,260

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;
and

the heat extraction structure is disposed between the mount and the first ceramic phosphor and directly connected to the mount.