LED apparatus employing tunable color filtering using multiple neodymium and fluorine compounds
The specification and drawings present a new apparatus such as a lighting apparatus, the apparatus comprising at least one LED (or OLED) module configured to generate a visible light such as white light, and at least one component such as an optical component comprising multiple (two or more) compounds, each containing neodymium (Nd) and at least one compound including fluorine (F) for imparting a desired color filtering effect to provide a desired light spectrum, where a color of the desired light spectrum in a color space is determined by relative amounts of the two or more compounds in the at least one component.
1. An apparatus comprising:
at least one light emitting diode (LED) module, configured to generate a visible light;
a phosphor; and
at least one component comprising two or more compounds, wherein at least one of the two or more compounds comprises Nd 2 O 3 , and wherein at least another one of the two or more compounds comprises a neodymium oxyfluoride having formula of Nd 1 O x F y where 2x+y=3 or a neodymium hydroxide fluoride having formula Nd(OH) a F b where a+b=3,
the at least one component being configured to provide a desired light spectrum by filtering the generated visible light using the two or more compounds,
wherein a color of the desired light spectrum in a color space is determined by relative amounts of the two or more compounds in the at least one component, and
wherein the at least one component-comprises more amount of the neodymium oxyfluoride having formula of Nd 1 O x F y where 2x+y=3 or the neodymium hydroxide fluoride having formula Nd(OH) a F b where a+b=3 than the amount Nd 2 O 3 .
2. The apparatus of claim 1 , wherein the color of the desired light spectrum in the color space is varied within a predefined area in the color space defined at least by absorption vectors of the two or more compounds.
3. The apparatus of claim 2 , wherein the predefined area in the color space is limited to about twelve MacAdam ellipses.
4. The apparatus of claim 1 , wherein the at least another one of the two or more compounds comprises NdF 3 .
5. The apparatus of claim 1 , wherein the at least one component is an encapsulating layer deposited on a top of the at least one LED module.
6. The apparatus of claim 5 , wherein the encapsulating layer is a low temperature glass, a polymer, a polymer precursor, a polycarbonate, a thermoplastic or thermoset polymer or resin, a silicone, or a silicone epoxy resin.
7. The apparatus of claim 1 , wherein the at least one component is an encapsulating layer deposited on a further encapsulating layer comprising a phosphor, the further encapsulating layer being deposited on a top of the at least one LED module.
8. The apparatus of claim 1 , wherein the at least one component is an optical component comprising a transparent, translucent or reflective substrate with a coating on a surface of the substrate, the coating comprising the two or more compounds to provide the desired light spectrum by filtering the generated visible light.
9. The apparatus of claim 8 , wherein a thickness of the coating is in a range from about 50 nm to about 1000 microns.
10. The apparatus of claim 1 , wherein the at least one component or the phosphor further comprises an additive having a higher refractive index than the two or more compounds, and wherein the additive is selected from metal oxides and non-metal oxides including at least one of TiO 2 , SiO 2 and Al 2 O 3 .
11. The apparatus of claim 8 , wherein the substrate is a diffuser being selected from the group consisting of a bulb, a lens, and a dome enclosing the at least one LED module.
12. The apparatus of claim 1 , wherein the apparatus comprises an integrated circuit containing a plurality of LED modules with a corresponding plurality of components.
13. The apparatus of claim 1 , wherein the at least another one of the two or more compounds comprises the neodymium oxyfluoride.