High-power white leds
AssigneeRensselaer Polytechnic Institute
InventorsNadarajah Narendran, Yimin Gu
Life of this patent
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Abstract
A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.
Claims15
A light emitting apparatus comprising:
- a first radiation source;
- a second radiation source having a dimension smaller than that of the first radiation source;
- an optic device comprising a top surface distal the radiation sources, a bottom surface proximal the radiation sources, and a transparent sidewall extending between the top surface and the bottom surface;
- and
- a down conversion material disposed adjacent to or on the top surface and extending from the transparent sidewall.
A light emitting apparatus comprising:
- a first radiation source without a dome;
- an optic device having a height smaller than 20 mm, and comprising a top surface distal the first radiation source, a bottom surface proximal the first radiation sources, and a transparent sidewall extending between the top surface and the bottom surface;
- a lens;
- and
- a down conversion material between the lens and the radiation source.
Dependencies are inferred from the claim text.