Light-emitting device and method for producing the same
A light-emitting device includes a substrate, a light-emitting element disposed on the substrate, and a sealing member for sealing the light-emitting element. The sealing member contains at least a particulate red phosphor. The red phosphor contains at least a Mn 4+ -activated fluoride complex phosphor. The sealing member has an upper surface with irregularities on at least part of the upper surface.
1. A light-emitting device comprising:
a substrate;
a light-emitting element on the substrate; and
a sealing member that seals the light-emitting element; wherein
the sealing member includes at least a particulate red phosphor and a particulate green phosphor,
the red phosphor includes at least a MN 4+ -activated fluoride complex phosphor,
the Mn 4+ -activated fluoride complex phosphor includes particles, and
the sealing member includes an upper surface that is recessed toward the light-emitting element from a circumferential edge of the sealing member in a plan view toward a center of the sealing member in the plan view, and includes convex portions that are defined by including the particles of the Mn 4+ -activated fluoride complex phosphor in the sealing member on at least a portion of the recessed upper surface of the sealing member.
2. The light-emitting device according to claim 1 , wherein a height of the upper surface of the sealing member with respect to the light-emitting element decreases from a circumferential edge of the sealing member in the plan view toward a center of the sealing member, and the red phosphor is distributed uniformly in the sealing member.
3. The light-emitting device according to claim 1 , wherein the red phosphor is included in an amount of two times or more and four times or less than an amount of the green phosphor on a mass basis.
4. The light-emitting device according to claim 1 , wherein
the sealing member further includes a sealing resin, and
the sealing resin has a viscosity of 2,000 (mPa·s) or more and 7,000 (mPa·s) or less.
5. The light-emitting device according to claim 1 , wherein a volume-based median diameter of the Mn 4+ -activated fluoride complex phosphor is 10 μm or more and 90 μm or less.
6. The light-emitting device according to claim 1 , wherein the sealing member further includes a red phosphor different from the Mn 4+ -activated fluoride complex phosphor.
7. The light-emitting device according to claim 6 , wherein the red phosphor different from the Mn 4+ -activated fluoride complex phosphor is CaAlSiN 3 :Eu or (Sr.Ca)AlSiN 3 :Eu.
8. The light-emitting device according to claim 1 , wherein the green phosphor is (Ba, Sr, Ca, Mg) 2 SiO 4 :Eu; (Mg, Ca, Sr, Ba)Si 2 O 2 N 2 :Eu; (Ba, Sr) 3 Si 6 O 12 N 2 :Eu, Eu-activated β-SiAlON; (Sr, Ca, Ba)(Al, Ga, In) 2 S 4 :Eu; (Y, Tb) 3 (Al, Ga) 5 O 12 :Ce; Ca 3 (Sc, Mg, Na, Li) 2 Si 3 O 12 :Ce; or (Ca, Sr)Sc 2 O 4 :Ce.
9. The light-emitting device according to claim 1 , wherein
the substrate includes an upper surface on which a recess is defined,
the recess includes a bottom surface on which the light-emitting element is located, and
the sealing member is in the recess.
10. The light-emitting device according to claim 9 , wherein the recess includes an opening having a length of 1 mm or more and 5 mm or less in a longer side direction and a length of 0.05 mm or more and 0.8 mm or less in a shorter side direction.
11. A mounting board comprising:
the light-emitting device according to claim 1 ; and
a substrate on which the light-emitting device is mounted, wherein
the light-emitting device includes a light emission surface, and a surface that is perpendicular to the light emission surface and mounted on the substrate.