Illumination apparatus having adjustable color temperature and method for adjusting the color temperature
First Claim
1. An illumination apparatus having adjustable color temperature, comprising:
- a blue-light source;
a transparent filter lens set on the top of the blue-light having a fluorescence layer of cerium-doped yttrium aluminum garnet (YAG) phosphor spread onto the transparent filter lens.
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Abstract
An illumination apparatus having adjustable color temperature and a method for adjusting the color temperature. The apparatus and the method can adjust the color temperature for different purposes. The illumination apparatus comprises: a blue-light source; a transparent filter lens set on the top of the blue-light source; a fluorescence layer of cerium-doped yttrium aluminum garnet (YAG) phosphor is spread onto the transparent filter lens. Replacing the yttrium and the aluminum in the cerium-doped yttrium aluminum garnet phosphor with gadolinium (Gd) and gallium (Ga) respectively can produce yellow lights of different wavelengths. Different yellow lights can then be mixed with the blue light to produce white lights of different color temperature.
107 Citations
20 Claims
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1. An illumination apparatus having adjustable color temperature, comprising:
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a blue-light source;
a transparent filter lens set on the top of the blue-light having a fluorescence layer of cerium-doped yttrium aluminum garnet (YAG) phosphor spread onto the transparent filter lens. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for adjusting the color temperature, including the following steps:
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providing a blue-light source;
providing a transparent filter lens;
forming a fluorescence layer inside the transparent filter lens;
wherein the fluorescence layer is composed of cerium-doped yttrium aluminum garnet, and the transparent filter lens is set above the blue-light source. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification