Light emissive ceramic laminate and method of making same
AssigneeNitto Denko Corporation
InventorsGuang Pan, Hironaka Fujii, Hiroaki Miyagawa, Rajesh Mukherjee, Bin Zhang, Toshitaka Nakamura, Amane Mochizuki
Life of this patent
Estimating the term…
Abstract
A ceramic composite laminate includes a wavelength-converting layer and a non-emissive layer, wherein the ceramic composite laminate has a wavelength conversion efficiency (WCE) of at least 0.650. The ceramic composite laminate can also include a wavelength-converting ceramic layer comprising an emissive material and a scattering material, wherein the laminated composite has a total transmittance of between about 40% to about 85%. The wavelength-converting layer may be formed from plasma YAG:Ce powder.
Claims36
A light emissive ceramic composite laminate comprising:
- at least one wavelength-converting ceramic layer comprising an emissive material;
- and
- at least one non-emissive layer of a substantially transparent ceramic material, wherein the wavelength-converting ceramic layer and the non-emissive layer are laminated in a thickness direction,
- wherein the light emissive ceramic composite laminate has a wavelength conversion efficiency (WCE) of at least about 0.650.
A method of manufacturing an emissive YAG:Ce composite laminate, comprising:
- providing at least one cast tape formed of a non-emissive material and at least one cast tape formed of an emissive material;
- stacking portions of the cast tapes to form an assembly;
- compressing the assembly to produce a preform;
- heating the preform to produce a green preform;
- and
- sintering the green preform to produce an emissive YAG:Ce composite laminate, wherein after the sintering, the emissive YAG:Ce composite laminate has a wavelength conversion efficiency (WCE) of at least about 0.650.
A light emissive ceramic composite laminate comprising:
- at least one wavelength-converting ceramic layer comprising an emissive material and a scattering material;
- and
- at least one non-emissive layer of a substantially transparent ceramic material, wherein the wavelength-converting ceramic layer and the non-emissive layer are laminated in a thickness direction, wherein the laminated composite has a total transmittance of between about 40% to about 85%.
Dependencies are inferred from the claim text.