Dynamic color or white light phosphor converted LED illumination system
First Claim
1. A light emitting device comprising at least first and second semiconductor radiation emitting components, which emit radiation having a first peak wavelength, a first phosphor material radiationally coupled with said first semiconductor radiation emitting component, the first phosphor material capable of absorbing at least a part of the radiation from the first radiation emitting component and emitting light of a second wavelength, and a second phosphor material radiationally coupled to said second semiconductor radiation emitting component, which is capable of absorbing at least a part of the radiation from the second radiation emitting component and emitting light of a third wavelength, such that when power supplied to at least one of the first and second semiconductor radiation components is varied, the color of light emitted by the light emitting device is changed.
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Accused Products
Abstract
A color tunable light emitting device includes multiple light emitting components such as light emitting diodes (LEDs) or laser diodes (LDs) with substantially the same emission characteristics, and multiple phosphors materials with different excitation and emission wavelengths, each excited by one of the light emitting components. The light emitting components are powered by an electrical circuit which allows separate control of the optical power output of the different light emitting components. The light from the light emitting components is arranged to impinge and excite a corresponding phosphor material such that the phosphors are excited and emit light at their characteristic wavelengths. By separately adjusting the power to each LED/LD, the amount of light emitted by each phosphor, and hence, through color mixing, the color of the light emitted, is varied.
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Citations
40 Claims
- 1. A light emitting device comprising at least first and second semiconductor radiation emitting components, which emit radiation having a first peak wavelength, a first phosphor material radiationally coupled with said first semiconductor radiation emitting component, the first phosphor material capable of absorbing at least a part of the radiation from the first radiation emitting component and emitting light of a second wavelength, and a second phosphor material radiationally coupled to said second semiconductor radiation emitting component, which is capable of absorbing at least a part of the radiation from the second radiation emitting component and emitting light of a third wavelength, such that when power supplied to at least one of the first and second semiconductor radiation components is varied, the color of light emitted by the light emitting device is changed.
- 20. A white light emitting device comprising at least first and second semiconductor radiation emitting components, which emit radiation having a first peak wavelength, a first white light emitting phosphor material radiationally coupled with said first semiconductor radiation emitting component, and a second white light emitting phosphor material radiationally coupled to said second semiconductor radiation emitting component, wherein the first and second phosphor materials have emissions with different x, y color coordinates on the 1931 CIE chromaticity diagram, taken either alone or with residual light bleed from the semiconductor radiation emitting components, such that when power supplied to at least one of the first and second semiconductor radiation components is varied, the CCT of white light emitted by the light emitting device is changed.
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40. A method of changing the color of light emitted by a light emitting device, said method comprising:
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providing first and second light emitting component which emits light of a first wavelength, a first phosphor material which absorbs at least a part of the light from the first light emitting component and emits light of a second wavelength, and a second phosphor material which absorbs at least a part of the light from the second light emitting component and emits light of a third wavelength; adjusting power supplied to at least one of the first and second light emitting components separately from the other of the first and second light emitting components such that the amount of light emitted by at least one of the first and second phosphor materials is correspondingly adjusted; and combining the light emitted by the first and second phosphor materials.
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Specification