High stability optical encapsulation and packaging for light-emitting diodes in the green, blue, and near UV range
AssigneeLumileds Lighting U.S., LLC
InventorsJulian A. Carey, William David Collins, III, Jason L. Posselt
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Abstract
An LED component is provided, with light emission in the green-to-near UV wavelength range. The light-emitting semiconductor die is encapsulated with one or more silicone compounds, including a hard outer shell, an interior gel or resilient layer, or both. The silicone material is stable over temperature and humidity ranges, and over exposure to ambient UV radiation. As a consequence, the LED component has an advantageously long lifetime, in which it is free of “yellowing” attenuation which would reduce the green-to-near UV light output.
Claims7
A light emitting diode (LED) component comprising:
- an LED chip emitting light having a wavelength in a range of 200 to 570 nanometers;
- and
- a package including a silicone optic encasing the LED chip comprising:
- an outer optically transmissive shell of rigid material;
- and
- a quantity of resilient, optically transmissive material inside the shell, comprising a silicone material being transmissive to light in the wavelength range from at least ultraviolet through green, wherein the silicone material maintains its transmissiveness when exposed to a temperature of 100° C.
A light emitting diode (LED) component comprising:
- an LED chip emitting light having a wavelength in a range of 200 to 570 nanometers;
- and
- a package including a silicone optic encasing the LED chip, the silicone optic comprising a silicone material being transmissive to light in a wavelength range from ultraviolet through green, wherein the silicone material maintains its transmissiveness when exposed to a temperature of 100° C.;
- and
- a light-emitting substance embedded in the silicone material, the light-emitting substance emitting light responsive to excitation by light of a predetermined wavelength, light emitted by the substance having a peak wavelength greater than the peak wavelength of light emitted by the LED chip.
Dependencies are inferred from the claim text.