Method for making an LED
AssigneeAgilent Technologies, Inc.
InventorsKheng Leng Tan, Abdul Karim Aizar, Su Lin Oon, Boon Chun Tan
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Abstract
A LED that includes a light emitter that emits light of a first wavelength and a phosphor layer that converts a portion of that light to light of a second wavelength is disclosed. The phosphor layer includes a powdered phosphor suspended in a photo-curable medium that sets upon exposure to light of a curing wavelength. The phosphor layer can also include a thixotropic agent that reduces the rate at which the powdered phosphor settles in the medium prior to the medium being exposed to light of the curing wavelength. The photo-curable medium preferably includes a photo-curable epoxy that cures in a time that is short compared to the settling time of the phosphor powder in the medium.
Claims4
A light source comprising:
- a light emitter that emits light of a first wavelength;
- and
- a phosphor layer covering said light emitter, said phosphor layer converting a portion of said light emitter of said first wavelength to light of a second wavelength, wherein, said phosphor layer comprises a powdered phosphor suspended in a photo-curable medium that sets upon exposure to light of a curing wavelength,
- wherein said photo-curable medium sets in a time less than that required for a change in concentration of said phosphor in said phosphor layer over said LED of more than 0.5 percent.
A light source comprising:
- a light emitter that emits light of a first wavelength;
- and
- a phosphor layer covering said light emitter, said phosphor layer converting a portion of said light emitter of said first wavelength to light of a second wavelength, wherein, said phosphor layer comprises a powdered phosphor suspended in a photo-curable medium that sets upon exposure to light of a curing wavelength,
- wherein said phosphor layer further comprises a thixotropic agent that reduces a rate at which said powdered phosphor settles in said photo-curable medium prior to said photo-curable medium being exposed to said light of said curing wavelength.
A method for fabricating a LED comprising:
- mounting a LED that emits light of a first wavelength on a substrate;
- suspending a powder of a phosphor that converts light of said first wavelength to light of a second wavelength in a photo-curable material that sets upon exposure to light of a curing wavelength;
- covering said LED with a laser of said photo-curable medium;
- and
- exposing said photo-curable medium to light of said curing wavelength,
- wherein said photo-curable medium sets in a time less than that required for a change in concentration of said phosphor in said phosphor layer over said LED of more than 0.5 percent.
A method for fabricating a LED comprising:
- mounting a LED that emits light of a first wavelength on a substrate;
- suspending a powder of a phosphor that converts light of said first wavelength to light of a second wavelength in a photo-curable material that sets upon exposure to light of a curing wavelength;
- covering said LED with a layer of said photo-curable medium;
- and
- exposing said photo-curable photo-curable medium to light of said curing wavelength,
- wherein said photo-curable medium further comprises a thixotropic agent that reduces a rate at which said powdered phosphor settles in said photo-curable medium prior to said photo-curable medium being exposed to said light of said curing wavelength.
Dependencies are inferred from the claim text.