Phosphor materials including fluidization materials for light sources
A method includes obtaining a potassium hexafluorosilicate (PFS)-based powder, obtaining a fluidization material, and mixing the PFS-based powder with the fluidization material to form a PFS-based mixture. The PFS-based mixture is configured to be mixed with a resinous material to form a flowing phosphor blend configured to be placed onto a light source to form a phosphor on the light source.
1. A phosphor body formed from:
a potassium hexafluorosilicate-based powder, wherein the potassium hexafluorosilicate-based powder comprises potassium hexafluorosilicate doped with manganese;
a fumed silica fluidization material, wherein the fumed silica fluidization material is present in an amount less than or equal to 0.1 wt % relative to a weight of the potassium hexafluorosilicate-based powder; and
a resinous material.
2. The phosphor body of claim 1 , wherein the manganese comprises Mn 4+ .
3. The phosphor body of claim 1 , wherein the fluidization material is formed as sub-micron sized particles.
4. The phosphor body of claim 1 , wherein the resinous material includes silicone.
5. The phosphor body of claim 1 , wherein the phosphor body has a greater quantum efficiency relative to another phosphor body formed from a phosphor blend that includes the potassium hexafluorosilicate-based powder and the resinous material and that does not include the fluidization material.
6. A phosphor body formed from:
a potassium hexafluorosilicate-based powder, wherein the potassium hexafluorosilicate-based powder comprises potassium hexafluorosilicate doped with Mn 4+ ;
a metal oxide fluidization material, wherein the fluidization material is formed as sub-micron sized particles, and wherein the metal oxide fluidization material is present in an amount less than or equal to 0.1 wt % relative to a weight of the potassium hexafluorosilicate-based powder; and
a resinous material.
7. The phosphor body of claim 6 , wherein the metal oxide fluidization material comprises alumina.
8. The phosphor body of claim 6 , wherein the particles of the metal oxide fluidization material have an average or median diameter less than one micrometer.
9. The phosphor body of claim 6 , wherein the metal oxide fluidization material is present in an amount of 0.03 wt % to 0.07 wt % relative to weight of the potassium hexafluorosilicate-based powder.
10. The phosphor body of claim 6 , said body at least partially encapsulating a light source.
11. The phosphor body of claim 6 , wherein addition of the metal oxide fluidization material to the potassium hexafluorosilicate-based powder increases the loose density of a mixture of the potassium hexafluorosilicate-based powder and the metal oxide fluidization material, relative to absence of the metal oxide fluidization material.
12. The phosphor body of claim 6 , formed by a method comprising the steps of:
mixing a potassium hexafluorosilicate-based powder with a metal oxide fluidization material to form a potassium hexafluorosilicate-based mixture,
mixing the potassium hexafluorosilicate-based mixture with a resinous material to form a flowing phosphor blend; and
curing or hardening the flowing phosphor blend to form the phosphor body.
13. A phosphor body formed from:
a potassium hexafluorosilicate-based powder, aluminum oxide powder, and a resinous material, wherein the aluminum oxide powder is present in an amount less than or equal to 0.1 wt % relative to a weight of the potassium hexafluorosilicate-based powder;
wherein said body at least partially encapsulating a light source.
14. The phosphor body of claim 13 , wherein particles of the aluminum oxide powder have an average or median diameter less than one micrometer.
15. The phosphor body of claim 13 , wherein the aluminum oxide powder is present in an amount of 0.03 wt % to 0.07 wt % relative to weight of the potassium hexafluorosilicate-based powder.