Color tunable light emitting device
First Claim
1. A color tunable light emitting device comprising:
- an array of excitation sources configured to generate excitation radiation having a first wavelength range;
wherein the array includes excitation sources arranged in a plurality of concentric circles;
an array of discrete wavelength converting components arranged in the concentric circles, each comprising a phosphor material, the phosphor material configured to convert excitation radiation to light having a second wavelength range;
wherein the array of wavelength converting components is uniformly movable relative to the array of excitation sources such that the excitation radiation is incident on different regions of the wavelength converting components;
wherein the phosphor material in the wavelength converting components has a concentration per unit area that varies spatially such that a variable amount of the excitation radiation is converted; and
wherein the light emitted by the device comprises a combination of light from the excitation source and the phosphor material.
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Accused Products
Abstract
A color/color temperature tunable light emitting device comprises: an excitation source (LED) operable to generate light of a first wavelength range and a wavelength converting component comprising a phosphor material which is operable to convert at least a part of the light into light of a second wavelength range. Light emitted by the device comprises the combined light of the first and second wavelength ranges. The wavelength converting component has a wavelength converting property (phosphor material concentration per unit area) that varies spatially. The color of light generated by the source is tunable by relative movement of the wavelength converting component and excitation source such that the light of the first wavelength range is incident on a different part of the wavelength converting component and the generated light comprises different relative proportions of light of the first and second wavelength ranges.
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Citations
7 Claims
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1. A color tunable light emitting device comprising:
- an array of excitation sources configured to generate excitation radiation having a first wavelength range;
wherein the array includes excitation sources arranged in a plurality of concentric circles;
an array of discrete wavelength converting components arranged in the concentric circles, each comprising a phosphor material, the phosphor material configured to convert excitation radiation to light having a second wavelength range;
wherein the array of wavelength converting components is uniformly movable relative to the array of excitation sources such that the excitation radiation is incident on different regions of the wavelength converting components;
wherein the phosphor material in the wavelength converting components has a concentration per unit area that varies spatially such that a variable amount of the excitation radiation is converted; and
wherein the light emitted by the device comprises a combination of light from the excitation source and the phosphor material. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- an array of excitation sources configured to generate excitation radiation having a first wavelength range;
Specification