US 2012/0068213 A1Published application

Light emissive ceramic laminate and method of making same

AssigneeNitto Denko Corporation

InventorsBin Zhang, Guang Pan, Hiroaki Miyagawa, Hironaka Fujii, Rajesh Mukherjee, Toshitaka Nakamura

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Abstract

A laminated composite includes a wavelength-converting layer and a non-emissive blocking layer, wherein the emissive layer includes a garnet host material and an emissive guest material, and the non-emissive blocking layer includes a non-emissive blocking material. The metallic element constituting the non-emissive blocking material has an ionic radius which is less than about 80% of an ionic radius of an A cation element when the garnet or garnet-like host material is expressed as A3B5O12 and/or an element constituting the emissive guest material, and the non-emissive blocking layer is substantially free of the emissive guest material migrated through an interface between the emissive layer and the non-emissive blocking layer.

Claims22

Dependent claims

A ceramic wavelength converting element comprising:

at least a first emissive layer comprising a garnet or garnet-like host material and an emissive guest material;
and
at least a first non-emissive blocking layer comprising a non-emissive blocking material consisting essentially of elements having ionic radii which are about 80% or less of an ionic radius of an A cation element when the garnet or garnet-like host material is expressed as A3B5O12 and/or an element constituting the emissive guest material,
wherein the first emissive layer and first non-emissive blocking layer are disposed in contact with each other and sintered together, and the first non-emissive blocking layer is substantially free of the emissive guest material migrated through an interface between the first emissive layer and the first non-emissive blocking layer.

1 more element

Dependencies are inferred from the claim text.