LIGHTING FIXTURE USING SEMICONDUCTOR COUPLED WITH A REFLECTOR HAVING REFLECTIVE SURFACE WITH A PHOSPHOR MATERIAL
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Abstract
To improve semiconductor-based systems for generating white light, a phosphor is integrated with an external structure, such as a reflector. A disclosed exemplary system, for illumination applications, utilizes one or more semiconductor devices for emitting radiant energy of a first wavelength. A reflector outside the package of the LED or other semiconductor device 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 associated with an external light processing element, for example, located along the surface of the reflector, to emit light, including visible light energy of at least one second wavelength different from the first wavelength. In the examples, 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
54 Claims
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1-34. -34. (canceled)
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35. A lighting fixture for emitting visible light, the lighting fixture comprising:
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a structure forming an optical integrating cavity, the optical integrating cavity comprising; a diffusely reflective inner surface of the cavity; and at least one optical passage through a diffusely reflective wall of the cavity for emission of radiant energy integrated by diffuse reflection within the cavity; a plurality of light emitting diodes (LED), each LED coupled for emission of radiant energy of a first wavelength into the cavity; and a coating layer containing at least one phosphor, extending across a substantial portion of 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. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A lighting fixture for emitting visible light, the lighting fixture comprising:
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a structure forming an optical integrating cavity, the optical integrating cavity comprising; a plurality of diffusely reflective walls forming inner surfaces of the cavity; and at least one optical passage for emission of radiant energy integrated by diffuse reflection within the cavity; a plurality of light emitting diodes (LED), each LED coupled for emission of radiant energy of a first wavelength into the cavity; and at least one phosphor doped within a substantial portion of an inner surface of at least one of the diffusely reflective walls 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. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54)
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Specification