Color-shifted lamps using neodymium-fluorine containing coating
The specification and drawings present a new apparatus such as a halogen incandescent lamp is presented herein, the apparatus comprising a light source such as a light-generating element made of tungsten, configured to generate a visible light such as white light having chromaticity coordinates of the light source in a clear center in a color space, and a component such as light-transmissive envelope, enclosing the light source and comprising a coating with a compound comprising elements of neodymium and fluorine and configured to provide a desired light spectrum by filtering the generated visible light using the compound, where the desired light spectrum having chromaticity coordinates in the color space being shifted from the clear center below the black-body locus and outside of a four-step MacAdam ellipse of the light source to meet a predefined requirement for a modified spectrum lamp.
1. An apparatus comprising:
a light source, configured to generate a visible light having chromaticity coordinates of the light source in a clear center in a color space; and
a light-transmissive envelope enclosing the light source and comprising a coating with a powder of a compound comprising elements of neodymium (Nd) and fluorine (F) and configured to provide a filtered light spectrum by filtering the generated visible light using the compound,
wherein the compound comprising elements of neodymium (Nd) and fluorine (F) is one or more of: neodymium oxyfluoride, neodymium hydroxide fluoride, or Nd—X—F, wherein X is one or more selected from the group consisting of O, N, S, Cl, OH, Na, K, Al, Mg, Li, Ca, Sr, Ba and Y;
wherein the filtered light spectrum having chromaticity coordinates in the color space being shifted from the clear center below a black-body locus and outside of a four-step MacAdam ellipse of the light source.
2. The apparatus of claim 1 , wherein the light source comprises a light-generating element made of tungsten (W).
3. The apparatus of claim 1 , wherein the apparatus comprises a modified-spectrum halogen incandescent lamp.
4. The apparatus of claim 3 , wherein the modified-spectrum halogen incandescent lamp comprises an inert gas and halogen species in a capsule enclosed with the light-transmissive envelope.
5. The apparatus of claim 4 , wherein the inert gas comprises at least one of xenon and krypton.
6. The apparatus of claim 1 , wherein the light-transmissive envelope is made of a glass material.
7. The apparatus of claim 1 , wherein the coating comprises a mixture of the powder of a compound comprising elements of neodymium (Nd) and fluorine (F), and one or more fluidizers.
8. The apparatus of claim 1 , wherein the compound is at least one of NdOF and Nd 4 O 3 F 6 .
9. The apparatus of claim 1 , wherein the coating is deposited on an inner surface of the light-transmissive envelope.
10. The apparatus of claim 1 , wherein the coating is applied to the light-transmissive envelope in an amount in a range from about 0.5 to about 4.0 mg/cm 2 .
11. The apparatus of claim 1 , wherein the coating is deposited onto the light-transmissive envelope by an electrostatic coating method.
12. The apparatus of claim 1 , wherein the coating further comprises one or more color powders.
13. The apparatus of claim 12 , wherein one of the one or more color powders is a blue color powder.
14. The apparatus of claim 1 , wherein the coating further comprises a scattering additive having a higher refractive index than the compound, and wherein the additive is selected from metal oxides and non-metal oxides.
15. The apparatus of claim 1 , wherein light source comprises an LED chip within the envelope.
16. The apparatus of claim 1 , wherein the coating is configured to provide enhancement of light parameters of the apparatus including one or more of color saturation index (CSI), color rendering index (CRI), color rendering value R9 and revealness (lighting preference index).
17. An apparatus comprising:
a light source, configured to generate a visible light having first chromaticity coordinates of the light source in a color space; and
a component enclosing the light source, the component having a coating comprising a powder of a compound comprising elements of neodymium (Nd) and fluorine (F) and configured to provide a filtered light spectrum having second chromaticity coordinates in the color space by filtering the generated visible light using the compound,
wherein the compound is one or more of neodymium oxyfluoride, neodymium hydroxide fluoride, or Nd—X—F, wherein X is one or more selected from the group consisting of O, N, S, Cl, OH, Na, K, Al, Mg, Li, Ca, Sr, Ba and Y;
wherein the filtered light spectrum having second chromaticity coordinates in the color space being shifted from the first color coordinates below a black-body locus and outside of a four-step MacAdam ellipse of the light source.
18. The apparatus of claim 17 , wherein the light source comprises a light-generating element made of tungsten (W), arranged in a capsule comprising an inert gas and halogen species.
19. An apparatus comprising:
a light source configured to generate a visible light having chromaticity coordinates of the light source in a clear center in a color space; and
a light-transmissive envelope enclosing the light source, the envelope comprising a coating with a compound configured to provide a filtered light spectrum by filtering the generated visible light using the compound, wherein the compound comprises Nd 3+ ions and F − ions and the compound is selected from the group consisting of NdOF and Nd 4 O 3 F 6 ,
wherein the light source is a halogen incandescent capsule comprising an inert gas and halogen species and the capsule is enclosed with the light-transmissive envelope,
wherein the filtered light spectrum has chromaticity coordinates in the color space being shifted from the clear center below a black-body locus and outside of a four-step MacAdam ellipse of the light source.