Color tunable light emitting device
First Claim
1. A color tunable light emitting device comprising:
- an excitation source operable to generate light of a first wavelength range and a wavelength converting component comprising at least one phosphor material which is operable to convert at least a part of the light into light of a second wavelength range, wherein light emitted by the device comprises the combined light of the first and second wavelength ranges, wherein the wavelength converting component has a wavelength converting property that varies spatially and wherein color of light generated by the source is tunable by a 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.
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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
22 Claims
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1. A color tunable light emitting device comprising:
- an excitation source operable to generate light of a first wavelength range and a wavelength converting component comprising at least one phosphor material which is operable to convert at least a part of the light into light of a second wavelength range, wherein light emitted by the device comprises the combined light of the first and second wavelength ranges, wherein the wavelength converting component has a wavelength converting property that varies spatially and wherein color of light generated by the source is tunable by a 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.
- View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- 2. The device according to claim 2, wherein a concentration per unit area of the at least one phosphor material varies spatially.
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19. A color tunable light emitting device comprising:
- a plurality of light emitting diodes operable to generate light of a first wavelength and a wavelength converting component which is operable to convert at least a part of the excitation radiation into light of a second wavelength, wherein light emitted by the device comprises the combined light of the first and second wavelength ranges and wherein the wavelength converting component comprises a plurality of wavelength converting regions comprising at least one phosphor material in which a respective region is associated with a respective one of the light emitting diode and wherein each region has a wavelength converting property that varies spatially and wherein color of light generated by the device is tunable by moving the component relative to the light emitting diodes such that the light of the first wavelength range from each light emitting diode is incident on a different part of its respective wavelength converting region.
- View Dependent Claims (20, 21, 22)
Specification