Light-emitting device and method of manufacturing same
A light-emitting device includes: a light-transmissive member having a first surface, a second surface opposite the first surface, and a third surface contiguous with the first surface and the second surface; a phosphor layer disposed opposite to the second surface of the light-transmissive member; a cover layer disposed on a lateral surface of the phosphor layer and the third surface of the light-transmissive member; a light-emitting element disposed opposite to the phosphor layer; and a light-reflective member that covers at least a portion of the cover layer.
1. A light-emitting device comprising:
a set of layers comprising (i) a light-transmissive member having a top surface, a bottom surface opposite the top surface, and a lateral surface contiguous with the top surface and the bottom surface, (ii) a first phosphor layer disposed below the bottom surface of the light-transmissive member, and (iii) a dielectric multilayer film between the light-transmissive member and the first phosphor layer;
a cover layer directly disposed on a lateral surface of the set of layers, the lateral surface of the set of layers comprising a lateral surface of the first phosphor layer, a lateral surface of the dielectric multilayer film, and the lateral surface of the light-transmissive member;
a light-emitting element disposed below the first phosphor layer; and
a light-reflective member that covers at least a portion of the cover layer,
wherein:
the light-emitting element emits blue light,
the first phosphor layer absorbs at least a portion of the blue light emitted by the light-emitting element and emits yellow-red to red light, and
the cover layer is either:
a second phosphor layer that absorbs at least a portion of the blue light emitted by the light-emitting element and emits yellow-red to red light, or
a pigment layer that presents yellow-red to red light.
2. The light-emitting device of claim 1 , wherein the light-transmissive member has a flat-plate shape.
3. The light-emitting device of claim 1 , wherein the first phosphor layer and the light-emitting element are directly bonded to each other.
4. The light-emitting device of claim 1 , wherein the first phosphor layer and the light-emitting element are bonded together via a bonding member.
5. The light-emitting device of claim 4 ,
wherein the light-emitting element has a top surface, a bottom surface opposite the top surface of the light-emitting element, and a lateral surface contiguous with the top and bottom surfaces of the light-emitting element,
wherein the top surface of the light-emitting element faces the first phosphor layer, and wherein the bonding member is disposed over the top surface and the lateral surface of the light-emitting element.
6. The light-emitting device of claim 5 , wherein the bonding member has a portion located over the lateral surface of the light-emitting element and having a substantially triangular shape in a cross section.
7. The light-emitting device of claim 1 , further comprising a base having a recess,
wherein the light-emitting element is disposed on a bottom surface of the recess, and
wherein the recess is filled with the light-reflective member.
8. The light-emitting device of claim 1 , further comprising a protection layer between the light-reflective member and the cover layer.
9. The light-emitting device of claim 1 , wherein the size of the light-emitting element is the same as or smaller than the size of the first phosphor layer in plan view.
10. The light-emitting device of claim 1 , wherein the cover layer is spaced apart from the light-emitting element in a direction in which the first phosphor layer, the dielectric multilayer film, and the light-transmissive member are arranged.
11. The light-emitting device of claim 1 , wherein the cover layer is adjacent to the light-emitting element in a direction in which the first phosphor layer, the dielectric multilayer film, and the light-transmissive member are arranged.
12. The light-emitting device of claim 1 , wherein the light-emitting element has a lateral surface and the light-reflective member covers at least a portion of the lateral surface of the light emitting element.
13. A light-emitting device comprising:
a set of layers comprising (i) a light-transmissive member having a top surface, a bottom surface opposite the top surface, and a lateral surface contiguous with the top surface and the bottom surface, (ii) a first phosphor layer disposed above the top surface of the light-transmissive member, and (iii) a dielectric multilayer film between the light-transmissive member and the first phosphor layer;
a cover layer directly disposed on a lateral surface of the set of layers, the lateral surface of the set of layers comprising a lateral surface of the first phosphor layer, a lateral surface of the dielectric multilayer film, and the lateral surface of the light-transmissive member;
a light-emitting element disposed below the light-transmissive member; and
a light-reflective member that covers at least a portion of the cover layer,
wherein:
the light-emitting element emits blue light,
the first phosphor layer absorbs at least a portion of the blue light emitted by the light-emitting element and emits yellow-red to red light, and
the cover layer is either:
a second phosphor layer that absorbs at least a portion of the blue light emitted by the light-emitting element and emits yellow-red to red light, or
a pigment layer that presents yellow-red to red light.
14. The light-emitting device of claim 13 , wherein the light-emitting element has a lateral surface and the light-reflective member covers at least a portion of the lateral surface of the light emitting element.