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. A lighting apparatus comprising:
an LED source configured to emit visible light; and
an optical component enclosing the LED source such that at least some of the visible light of the LED source passes therethrough;
wherein, at least a portion of the optical component is formed of a composite material comprising a polymeric matrix material and a particulate material that contributes a color filtering effect to the visible light passing through the composite material, the particulate material having a particle size of up to 50 micrometers and comprising 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 lighting apparatus according to claim 1 , wherein the optical component is an enclosure or dome.
3. The lighting apparatus according to claim 1 , wherein the particulate material predominantly filters wavelengths in a yellow light wavelength range.
4. The lighting apparatus 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 lighting apparatus according to claim 1 , wherein the neodymium compound is Nd—O—F.
6. The lighting apparatus according to claim 1 , wherein X is at least one metallic element other than neodymium that forms a compound with fluorine.
7. The lighting apparatus 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 lighting apparatus 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 lighting apparatus 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. A lighting apparatus comprising: an LED source; and
an optical component enclosing the LED source permitting at least some of the visible light from the LED source to pass therethrough;
wherein, at least a portion of the optical component is formed of a composite material comprising a polymeric matrix material and a particulate material (i) contributing a color filtering effect to the visible light passing through the composite material (ii) having a particle size of up to 50 micrometers and (iii) comprising 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.
11. The lighting apparatus according to claim 10 , wherein the neodymium compound and the polymeric matrix material have refractive indices within 0.1 of each other in the visible light region.
12. The lighting apparatus according to claim 10 , wherein the particulate material and the polymeric matrix material have refractive indices within 0.1 of each other in the visible light region.
13. The lighting apparatus according to claim 12 , 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.
14. The lighting apparatus according to claim 13 , wherein a source of the Nd 3+ ions is NdF3.
15. The lighting apparatus according to claim 13 , 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.
16. The lighting apparatus according to claim 13 , wherein the particles are formed of at least one material chosen from the group consisting of NaF, MgF2, KF, AIF3, LiF, CaF2, SrF2, BaF2, and YF 3 .
17. The lighting apparatus according to claim 10 , 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 lighting apparatus according to claim 17 , wherein the neodymium compound is present as discrete particles of the particulate material.
19. The lighting apparatus according to claim 18 , wherein the particulate material further comprises particles of a second material other than a neodymium compound.
20. The lighting apparatus according to claim 19 , wherein the second material has a higher refractive index than the neodymium compound and is chosen from the group consisting of titania, neodymium-containing compounds, and neodymium oxide compounds.