Lighting device with a phosphor layer on a peripheral side surface of a light-emitting element and a reflecting layer on an upper surface of the light-emitting element and on an upper surface of the phosphor layer
View Patent ↗In a first aspect of the present inventive subject matter, a lighting device includes a light-emitting element that includes a first electrode and a second electrode on a lower surface of the light-emitting element; a phosphor layer directly covering a peripheral side surface of the light-emitting element; and a light-reflecting layer that is in contact with an upper surface of the light-emitting element and in contact with an upper surface of the phosphor layer directly covering the peripheral side surface of the light-emitting element.
1. A lighting device comprising:
a substrate comprising an upper surface, and at least one pair of electrodes arranged on the upper surface of the substrate;
two or more light-emitting elements each comprising:
a lower surface;
an upper surface;
four peripheral side surfaces;
a first electrode and a second electrode on the lower surface, the first electrode and the second electrode electrically connected to the at least one pair of electrodes of the substrate;
a phosphor layer with a constant width being arranged in contact with the four peripheral side surfaces of the light-emitting element, the phosphor layer comprising an upper surface and four peripheral side surfaces; and
a light-reflecting layer that is arranged in contact with the upper surface of the light-emitting element and the upper surface of the phosphor layer, the light-reflecting layer being arranged to be free from contact with any portion of the four peripheral side surfaces of the phosphor layer;
a light-transmitting cover that is transparent or translucent and arranged above the light-reflecting layers of the two or more light-emitting elements; and
a frame member disposed on the substrate to surround the four peripheral side surfaces of each of the two or more light-emitting elements and comprising two or more openings, each of the two or more openings having at least one of the two or more light-emitting elements arranged therein, the frame member being configured to shield and/or reflect light and comprising a white-colored resin and a light-shielding member buried in the white-colored resin of the frame member.
2. The lighting device according to claim 1 , wherein
the two or more light-emitting elements and the phosphor layers are same in height.
3. The lighting device according to claim 1 , wherein
the phosphor layers are smaller than the two or more light-emitting elements in width.
4. The lighting device according to claim 1 , wherein
the upper surface of each of the two or more light-emitting elements comprises a sloping surface.
5. The lighting device according to claim 1 , wherein
the two or more openings of the frame member are aligned in a line.
6. The lighting device according to claim 1 , wherein
the two or more openings of the frame member are arranged in a shape of a grid and formed so as to separate each of the two or more light-emitting elements from each other.
7. The lighting device according to claim 1 ,
wherein the two or more openings of the frame member each comprise sloping surfaces facing the four peripheral side surfaces of the at least one of the two or more light-emitting elements.
8. The lighting device according to claim 1 ,
wherein the light-reflecting layer of each of the two or more light-emitting elements comprises a metallic layer, and
wherein the metallic layer of the light-reflecting layer of each of the two or more light-emitting elements has a reflectivity of 50% or more.