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US 10,971,658 B2Granted
Infrared emitting device
AssigneeLumileds LLC
InventorsPeter Josef Schmidt, Detlef Wiechert
Life of this patent
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Abstract
Embodiments of the invention include a light source and a wavelength converting structure disposed in a path of light emitted by the light source. The wavelength converting structure includes a first phosphor that emits infrared light and a second phosphor that emits visible light. In some embodiments, the light source emits first light, the second phosphor absorbs the first light and emits second light, and the first phosphor absorbs the first light and emits third light and absorbs the second light and emits fourth light.
Claims20
A device comprising:
- a light source emitting a first light;
- and
- a wavelength converting structure disposed in a path of the first light emitted by the light source, the wavelength converting structure comprising:
- a first phosphor;
- and
- a second phosphor;
- the second phosphor absorbing the first light and emitting a second light, which second light is visible light, the first phosphor absorbing the first light and emitting a third light, the first phosphor absorbing the second light and emitting a fourth light, the third light and the fourth light have different peak wavelengths in the infrared emission range.
4 more elements
Dependencies are inferred from the claim text.