Materials and optical components for color filtering in a lighting apparatus
Materials and optical components formed thereof that are suitable for use in a lighting apparatus to impart a color filtering effect to visible light. At least a portion of such an optical component is formed of a composite material comprising a polymeric matrix material and an inorganic particulate material that contributes a color filtering effect to visible light passing through the composite material, and the particulate material comprises a neodymium compound containing Nd 3+ ions.
1. An optical component of a lighting apparatus, at least a portion of the optical component being formed of a composite material comprising a polymeric matrix material and a particulate material that contributes a color filtering effect to visible light passing through the composite material;
wherein, the particulate material has a particle size of up to 50 micrometers and comprises a neodymium compound containing Nd 3+ ions, the neodymium compound being a Nd—X—F compound;
and wherein X is at least one element that forms a compound with neodymium.
2. The optical component according to claim 1 , wherein the particulate material predominantly filters wavelengths in a yellow light wavelength range.
3. The optical component according to claim 1 , wherein the neodymium compound is present as discrete particles of the particulate material.
4. The optical component according to claim 1 , wherein the particulate material is an inorganic particulate material, and wherein the neodymium compound is present as a dopant in particles of the inorganic particulate material.
5. The optical component according to claim 1 , wherein the neodymium compound is Nd—O—F.
6. The optical component according to claim 1 , wherein X is at least one metallic element other than neodymium that forms a compound with fluorine.
7. The optical component according to claim 1 , wherein X is at least one element chosen from the group consisting of: elements that form compounds with neodymium; and metallic elements other than neodymium that form compounds with fluorine.
8. The optical component according to claim 1 , wherein the neodymium compound is present in the composite material in an amount of at least about 0.1 volume percent.
9. The optical component according to claim 1 , wherein the neodymium compound is present in the composite material in an amount of about 1 to about 20 volume percent.
10. The optical component according to claim 1 , wherein the neodymium compound and the polymeric matrix material have refractive indices within 0.1 of each other in the visible light region.
11. The optical component according to claim 1 , wherein the particulate material and the polymeric matrix material have refractive indices within 0.1 of each other in the visible light region.
12. The optical component according to claim 11 , wherein the neodymium compound is present as a dopant in particles of the particulate material, and the particles are formed of a second material other than the neodymium compound.
13. The optical component according to claim 12 , wherein a source of the Nd 3+ ions is NdF 3 .
14. The optical component according to claim 12 , wherein the particles are formed of at least one material selected from metal fluorides or metal oxides having refractive indices less than the polymeric matrix material.
15. The optical component according to claim 12 , wherein the particles are formed of at least one material chosen from the group consisting of NaF, MgF 2 , KF, AlF 3 , LiF, CaF 2 , SrF 2 , BaF 2 , and YF 3 .
16. The optical component according to claim 11 , wherein the optical component is an enclosure or dome enclosing an LED device of the lighting apparatus.
17. The optical component according to claim 1 , wherein the particulate material and the polymeric matrix material have refractive indices that differ by more than 0.1 in the visible light region.
18. The optical component according to claim 17 , wherein the neodymium compound is present as discrete particles of the particulate material.
19. The optical component according to claim 18 , wherein the particulate material further comprises particles of a second material other than a neodymium compound.
20. The optical component according to claim 19 , wherein the second material has a higher refractive index than the neodymium compound.
21. The optical component according to claim 20 , wherein the second material is chosen from the group consisting of titania, neodymium-containing compounds, and neodymium oxide compounds.
22. A lighting apparatus comprising a light source that emits visible light and an optical component configured and arranged so that at least some of the visible light of the light source passes therethrough, a portion of the optical component being formed of a composite material comprising a polymeric matrix material and an inorganic particulate material having a particle size of up to 50 micrometers, the composite material and the inorganic particulate material both contributing a color filtering effect to the visible light passing through the portion;
wherein, the inorganic particulate material comprises a Nd—X—F compound;
and wherein X is at least one element that forms a compound with neodymium.