Reflective surface sub-assembly for a light-emitting device
View Patent ↗A reflective surface sub-assembly for a light-emitting device, comprising a substrate, at least one area reserved for placement of a light-emitting device assembly on the substrate, and a diffusive reflective layer applied on selected regions on the substrate, wherein if the light-emitting device assembly were placed onto the at least one area then the diffusive reflective layer would reflect photons emitted by the light-emitting device assembly is disclosed.
1. A reflective surface sub-assembly for a light-emitting device, comprising:
a substrate;
at least one area reserved for placement of a light-emitting device assembly on the substrate; and
a diffusive reflective layer applied on selected regions on the substrate as a paste comprising
a polymer matrix,
a titanium oxide or other oxide phases or compositions filler, and
a rheological additive comprising a silica and an alumna; wherein
upon placing the light-emitting device assembly onto the at least one area then the diffusive reflective layer would reflect photons emitted by the light-emitting device assembly.
2. The apparatus according to claim 1 , wherein the substrate is substantially flat.
3. The apparatus according to claim 1 , wherein the diffusive reflective layer is characterized by at least 50% diffusive reflectivity.
4. The apparatus according to claim 1 , wherein the diffusive reflective layer is characterized by at least 70% diffusive reflectivity.
5. The apparatus according to claim 1 , wherein the reflective layer fills irregularities in a face of the substrate.
6. The apparatus according to claim 1 , wherein the diffusive reflective layer comprises titanium oxide or other oxide phases or compositions.
7. The apparatus according to claim 1 , wherein the diffusive reflective layer comprises titanium dioxide.
8. The apparatus according to claim 1 , wherein the loading levels of the paste's composition comprise:
the titanium oxide or other oxide phases or compositions filler in an amount of 10%-75%,
the silica in an amount of 0%-4%, and
the alumna in an amount of 0.1-2%.
9. The apparatus according to claim 8 , wherein the titanium oxide or other oxide phases or compositions filler comprises titanium dioxide filler.
10. The apparatus according to claim 1 , wherein the selected regions on the substrate exclude the at least one area reserved for placement of a light-emitting device assembly.
11. The apparatus according to claim 1 , wherein the selected regions on the substrate include the at least one area reserved for placement of a light-emitting device assembly.
12. The apparatus according to claim 1 , wherein the at least one area reserved for placement of the light-emitting device assembly is equivalent to the area of the light-emitting device assembly to be placed on the at least one area reserved for placement.
13. The apparatus according to claim 1 , wherein the at least one area reserved for placement of the light-emitting device assembly is greater than the area of the light-emitting device assembly to be placed on the at least one area reserved for placement.
14. The apparatus according to claim 1 , further comprising a light-emitting device assembly placed on the at least one area reserved for placement of the light-emitting device assembly.
15. A light emitting device assembly, comprising the reflective surface sub-assembly of claim 1 , and a semiconductor light emitting device.