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US 10,770,627 B2Granted
Wavelength converting material for a light emitting device
AssigneeLumileds Holding B.V.
InventorsPeter Josef Schmidt, Rob Engelen, Thomas Diederich
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Abstract
Embodiments of the invention include an infrared-emitting phosphor comprising (La,Gd)3Ga5−x−yAlxSiO14:Cry, where 0≤x≤1 and 0.02≤y≤0.08. In some embodiments, the infrared-emitting phosphor is a calcium gallogermanate material. In some embodiments, the infrared-emitting phosphor is used with a second infrared-emitting phosphor. The second infrared-emitting phosphor is one or more chromium doped garnets of composition Gd3−x1Sc2−x2−yLux1+x2Ga3O12:Cry, where 0.02≤x1≤0.25, 0.05≤x2≤0.3 and 0.04≤y≤0.12.
Claims17
A luminescent material, comprising:
- a host lattice crystallizing in a trigonal calcium gallogermanate structure type;
- and
- dopants disposed in the host lattice, the dopants comprising:
- trivalent chromium;
- and
- tetravalent chromium in a concentration that is less than 1% of a total concentration of all chromium in the luminescent material.
3 more elements
Dependencies are inferred from the claim text.