Optical system using LED coupled with phosphor-doped reflective materials
First Claim
1. A lighting system, for emitting visible light so as to be humanly perceptible, the lighting system comprising:
- an energy source package, for emitting radiant energy of a first wavelength;
a reflector outside the energy source package, having a reflective surface arranged to receive radiant energy from the energy source package;
at least one phosphor doped within the reflector, such that radiant energy of the first wavelength from the energy source package excites the at least one phosphor to emit visible light, comprising visible light energy of at least one second wavelength different from the first wavelength, wherein at least some of visible light emitted by the at least one phosphor is reflected by the reflective surface of the reflector, and the lighting system directs at least the visible light emitted by the at least one phosphor so that it can be perceived by a person.
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Accused Products
Abstract
To improve semiconductor-based systems for generating white light, a phosphor is integrated into a reflective material of an external structure. A disclosed exemplary system, for luminance or illumination applications, utilizes an energy source package, for emitting radiant energy of a first wavelength. The package typically contains an LED or other semiconductor device. A reflector outside the package has a reflective surface arranged to receive radiant energy from the energy source. At least some of the received radiant energy of the first wavelength excites one or more phosphors doped within the reflector to emit visible light, including visible light energy of at least one second wavelength different from the first wavelength. At least some of visible light emitted by the phosphor is reflected by the reflective surface of the reflector and directed to facilitate the particular humanly perceptible luminance or illumination application.
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Citations
34 Claims
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1. A lighting system, for emitting visible light so as to be humanly perceptible, the lighting system comprising:
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an energy source package, for emitting radiant energy of a first wavelength;
a reflector outside the energy source package, having a reflective surface arranged to receive radiant energy from the energy source package;
at least one phosphor doped within the reflector, such that radiant energy of the first wavelength from the energy source package excites the at least one phosphor to emit visible light, comprising visible light energy of at least one second wavelength different from the first wavelength, wherein at least some of visible light emitted by the at least one phosphor is reflected by the reflective surface of the reflector, and the lighting system directs at least the visible light emitted by the at least one phosphor so that it can be perceived by a person. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A lighting system, for emitting visible light, the lighting system comprising:
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a structure forming an optical integrating cavity comprising a material forming a diffusely reflective inner surface of the cavity and at least one passage for emission of radiant energy integrated by diffuse reflection within the cavity;
a light emitting semiconductor device, coupled for emission of radiant energy of a first wavelength into the cavity; and
at least one phosphor doped into the material forming the diffusely reflective inner surface of the cavity, the at least one phosphor being of a type excited by radiant energy of the first wavelength for emission of visible light of at least one second wavelength different from the first wavelength for reflection and integration within the cavity so as to be included in light emitted through the at least one passage. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method of producing substantially white light for an application visible by a person, the method comprising:
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generating light of a first wavelength;
impinging at least a portion of the light of the first wavelength on a diffusely reflective surface of a doped material;
exciting a first phosphor within the doped material with a first portion of the light of the first wavelength impinging on the diffusely reflective surface, so that the first phosphor emits visible light of a second wavelength different from the first wavelength;
exciting a second phosphor within the doped material with radiant energy, so that the second phosphor emits visible light of a third wavelength different from the first and second wavelengths;
diffusely reflecting at least some of the light of the first wavelength from the diffusely reflective surface, so as to combine light of the first wavelength with the light of the and second and third wavelengths to form the substantially white light; and
emitting the substantially white light toward a region intended to be illuminated for the application visible by the person.
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- 31. The method of claims 31, wherein the radiant energy exciting the second phosphor comprises a second portion of the light of the first wavelength impinging on the diffusely reflective surface.
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33. A method of producing substantially white light for a humanly perceptible visible lighting application, the method comprising:
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emitting radiant energy of a first wavelength into a space defined by a diffusely reflective surface;
impinging at least a portion of the radiant energy of the first wavelength on a phosphor doped material forming the diffusely reflective surface;
exciting a phosphor within the doped material with a portion of the radiant energy of the first wavelength impinging on the diffusely reflective surface, so that the first phosphor emits radiant energy of one or more second wavelengths different from the first wavelength into the space, wherein the radiant energy wavelengths within the space comprise at least two colors of visible light;
diffusely reflecting at least some of the radiant energy wavelengths of the visible light from the diffusely reflective surface, so as to combine the at least two colors of visible light and thereby form the substantially white light; and
emitting the substantially white light toward a region intended to be illuminated for the humanly perceptible lighting application. - View Dependent Claims (34)
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Specification