Light source using emitting particles to provide visible light

Details Light source using emitting particles to provide visible light Light source using emitting particles to provide visible light

2006-08-08

2006-08-08

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

C445S023000

Reexamination Certificate

active

07088040

ABSTRACT:
Upconversion methods and devices that converts near-infrared light to the visible spectrum using a rare-earth-doped crystalline host for use as general and decorative lighting. The pseudo-monochromatic output of the processes can be specified by altering the amount and type of rare-earth material used and by selection of an appropriate host. Using rare-earth materials such as ytterbium-erbium or ytterbium-thulium can produce red, green and blue emissions, where the additive mixture of these colors yields a high-quality white light. The materials can be adjusted to achieve white light with any color temperature and high color-rendering index (CRI) for any general and decorative lighting applications both indoors and outdoors.

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