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US 12,720,927 B2Granted
Crack sensitivity reduction in porous optical layers
AssigneeLumileds Singapore Pte. Ltd.
InventorsMarcel Rene Bohmer, Emma Dohner
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Abstract
A lighting device is disclosed that includes a plurality of light emitting diodes arranged in an array, trenches disposed between the light emitting diodes, and a scattering layer disposed in the trenches, the scattering layer including a binder matrix, a plurality of scattering particles disposed in the binder matrix, and a plurality of porous particles containing a gas, the porous particles disposed in the binder matrix.
Claims16
A light emitting device comprising:
- a plurality of light emitting diodes arranged in an array extending in a horizontal direction;
- a plurality of phosphor pixels disposed over the light emitting diodes in a vertical direction perpendicular to the horizontal direction, and
- a scattering layer disposed in gaps between phosphor pixels, the scattering layer comprising:
- a binder matrix,
- a plurality of scattering particles disposed in the binder matrix, and
- a plurality of larger particles disposed in the matrix, the larger particles being larger than the scattering particles.
3 more elements
A method of forming a converter layer for a lighting device, the method comprising:
- forming a plurality of phosphor pixels on a carrier substrate;
- depositing a layer of a mixture into gaps between the phosphor pixels, the mixture comprising scattering particles, porous particles containing a gas, a binder matrix precursor material, and a solvent;
- curing the layer to remove the solvent and convert the binder matrix precursor material into a binder matrix, the scattering particles and porous particles being disposed within the binder matrix to form a scattering layer in the gaps, and
- removing the substrate to form a converter layer structure.
1 more element
Dependencies are inferred from the claim text.