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US 11,155,489 B2Granted
Coated wavelength converting material for a light emitting device
AssigneeLumileds LLC
InventorsPeter Josef Schmidt, Cas Groenendijk
Life of this patent
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Abstract
Embodiments of the invention include a transparent material such as glass including a metal such as bismuth, particles of luminescent material such as a nitride phosphor disposed in the transparent material, and a coating disposed over the particles of luminescent material. The coating is formed to prevent reaction between the particles of luminescent material and the metal. The coating may be silica.
Claims12
A wavelength converting structure comprising:
- a transparent material comprising a metal ion;
- particles of luminescent material disposed in the transparent material;
- and
- a coating disposed over the particles of luminescent material, the coating comprising silica and having a density of from 2.1-2.16 g/cm3 to prevent reaction between the particles of luminescent material and the metal ion.
1 more element
A method comprising:
- coating particles of phosphor with silica;
- after said coating, heating the coated particles to densify the coating;
- and
- after said heating, embedding the coated particles in a glass comprising bismuth, wherein the coating is formed to prevent the bismuth from being reduced due to contact with the phosphor.
1 more element
Dependencies are inferred from the claim text.