Back to results
US 2019/0195466 A1Published application
Ceramic phosphor with lateral light barriers
AssigneeLumileds LLC
InventorsKentaro SHIMIZU, Venkata Ananth TAMMA, Hisashi MASUI
Life of this patent
Estimating the term…
Abstract
A device including a phosphor layer having a plurality of air gaps arranged within the phosphor layer to block lateral light transmission. The phosphor layer can be sized and positioned to be continuously extend over a plurality of LED emitter pixels.
Claims19
A device comprising:
- a phosphor layer comprising phosphor material and at least one of a ceramic, a glass, or an organic binder;
- and
- a plurality of air gaps arranged within the phosphor layer to block light transmission.
A LED package comprising:
- a phosphor layer comprising phosphor material and at least one of a ceramic, a glass, or an organic binder, and having a plurality of air gaps arranged within to reduce lateral light transmission through the phosphor layer;
- and
- a light emitting diode (LED) array attached to the phosphor layer, each LED in the array including an emitter pixel.
A method of making a ceramic phosphor layer, the method comprising the steps of:
- combining ceramic powder precursors, a ceramic binder, phosphor material, and solvent to form a mixture;
- coating the mixture onto a substrate to form a film;
- creating conditions for air gap formation in selected regions of coated mixture by at least one of deforming or removing material from the film, or adding at least one of sacrificial material, sintering rods, and beads to the film;
- and
- heating the film to form a ceramic phosphor with air gaps in selected regions.
2 more elements
A method making a ceramic phosphor layer with lateral light barriers, the method comprising the steps of:
- mixing ceramic powder precursors, the ceramic binder, solvent, and polymeric beads or rods;
- slotting die coating onto a substrate to form a thin film;
- layering multipole sheets to from thicker layers;
- sintering rods and beads to create air pockets;
- and
- cutting or polishing the layers.
3 more elements
Dependencies are inferred from the claim text.