Light-emitting device and method of manufacturing the light-emitting device
A light-emitting device includes: a package defining a recess; a light-emitting element disposed on a bottom surface of the recess; and a sealing member disposed in the recess so as to cover the light-emitting element. The sealing member includes a filler-containing layer which contains a filler and covers the light-emitting element, and a light-transmissive layer disposed on the filler-containing layer. The recess is further defined by a lateral surface having a stepped portion between the bottom surface of the recess and an opening of the recess. The light-transmissive layer covers the stepped portion. An upper surface of the light-transmissive layer is downwardly recessed.
1. A light-emitting device comprising:
a package defining a recess;
a light-emitting element disposed on a bottom surface of the recess; and
a sealing member disposed in the recess so as to cover the light-emitting element, wherein:
the sealing member comprises a filler-containing layer which contains a light-reflective filler and a light-transmissive resin and covers the light-emitting element, and a light-transmissive layer which contains the light-transmissive resin, is free of the light-reflective filler, and is disposed on the filler-containing layer,
the recess is further defined by a lateral surface having a stepped portion between the bottom surface of the recess and an opening of the recess,
the light-transmissive layer covers the stepped portion,
an upper surface of the light-transmissive layer is downwardly recessed,
an entire upper surface of the filler-containing layer is below the stepped portion, and
the upper surface of the light-reflective filler in the filler-containing layer is directly below the stepped portion.
2. The light-emitting device according to claim 1 , wherein:
the filler-containing layer has a thickness of twice or more of the height of the light-emitting element.
3. The light-emitting device according to claim 1 , wherein:
the light-reflective filler is composed of at least one of titanium oxide, silica, silicon oxide, aluminum oxide, zirconium oxide, magnesium oxide, potassium titanate, zinc oxide, or boron nitride.
4. The light-emitting device according to claim 1 , wherein:
the sealing member is formed by:
supplying an uncured sealing member into the recess, the uncured sealing member comprising the light-reflective filler and the light-transmissive resin, and
applying a centrifugal force to the package in a direction perpendicular to the bottom surface of the recess to sediment the light-reflective filler toward the bottom surface of the recess to form the filler-containing layer and the light-transmissive layer.
5. The light-emitting device according to claim 1 , wherein:
the sealing member further comprises a phosphor layer containing a phosphor, and the filler-containing layer is disposed between the phosphor layer and the light-transmissive layer.
6. The light-emitting device according to claim 5 , wherein:
the phosphor layer covers the bottom surface of the recess and an upper surface of the light-emitting element.
7. The light-emitting device according to claim 5 , wherein:
the phosphor layer has a thickness of equal to or less than half the height of the light-emitting element.
8. The light-emitting device according to claim 5 , wherein:
the filler-containing layer does not contain a phosphor.
9. A light-emitting device comprising:
a package defining a recess;
a light-emitting element disposed on a bottom surface of the recess; and
a sealing member disposed in the recess so as to cover the light-emitting element, wherein:
the sealing member comprises a filler-containing layer which contains a filler and a light-transmissive resin and covers the light-emitting element, a light-transmissive layer which contains the light-transmissive resin and is disposed on the filler-containing layer, and a phosphor layer which contains a phosphor, wherein the filler-containing layer does not contain a phosphor,
the recess is further defined by a lateral surface having a stepped portion between the bottom surface of the recess and an opening of the recess,
the light-transmissive layer covers the stepped portion,
an upper surface of the light-transmissive layer is downwardly recessed,
an entire upper surface of the filler-containing layer is below the stepped portion, and
the upper surface of the filler in the filler-containing layer is directly below the stepped portion.
10. The light-emitting device according to claim 9 , wherein:
the phosphor layer covers the bottom surface of the recess and an upper surface of the light-emitting element.
11. The light-emitting device according to claim 9 , wherein:
the phosphor layer has a thickness of equal to or less than half the height of the light-emitting element.