Light-emitting device with fluorescent layer
A light-emitting device is provided, which includes a supporting member, a light-emitting element disposed on the supporting member to emit a light, and a fluorescent layer formed on the light-emitting element and having a thickness ranging from 80 to 240 μm, the fluorescent layer containing a light-transmitting member and a fluorescent substance having a particle diameter ranging from 20 to 45 μm at a concentration of 40 to 60 wt %.
1. A light-emitting device comprising:
a supporting member;
a light-emitting element disposed on the supporting member to emit a light; and
a fluorescent layer formed on the light-emitting element and having a thickness ranging from 80 to 240 μm, the fluorescent layer containing a light-transmitting member and a fluorescent substance having a particle diameter ranging from 20 to 45 μm at a concentration of 40 to 60 wt %, and a surface of the fluorescent layer in contact with an external atmosphere has recesses and projections that correspond to an arrangement of the particles of the fluorescent substance.
2. The light-emitting device according to claim 1 , wherein a profile of the surface of the fluorescent layer corresponds to a configuration of the fluorescent substance.
3. The light-emitting device according to claim 1 , wherein the light of the light-emitting element has a wavelength ranging from 400 to 550 nm.
4. The light-emitting device according to claim 1 , wherein the light-transmitting member contains silicone resin.
5. The light-emitting device according to claim 1 , wherein the fluorescent layer has a thickness ranging from 100 to 150 μm.
6. The light-emitting device according to claim 1 , wherein the fluorescent layer contains the fluorescent substance at a concentration ranging from 50 to 60 wt %.
7. The light-emitting device according to claim 1 , wherein the light of the light-emitting element is a blue light and the fluorescent substance contains a yellow fluorescent substance.
8. The light-emitting device according to claim 7 , wherein the yellow fluorescent substance is an europium-activated alkaline earth metal silicate-based fluorescent substance.
9. A light-emitting device comprising:
a supporting member;
a light-emitting element disposed on the supporting member to emit a light; and
a fluorescent layer formed on the light-emitting element and containing a light-transmitting member and a fluorescent substance, the fluorescent layer having a recessed/projected surface in contact with an external atmosphere and recesses and projections in the recessed/projected surface in contact with the external atmosphere correspond to an arrangement of the particles of the fluorescent substance.
10. The light-emitting device according to claim 9 , wherein the fluorescent layer has a thickness ranging from 80 to 240 μm, and the fluorescent substance having a particle diameter ranging from 20 to 45 pm and contained in the fluorescent layer at a concentration of 40 to 60 wt %.
11. The light-emitting device according to claim 9 , wherein the light of the light-emitting element has a wavelength ranging from 400 to 550 nm.
12. The light-emitting device according to claim 9 , wherein the light-transmitting member contains silicone resin.
13. The light-emitting device according to claim 9 , wherein the fluorescent layer has a thickness ranging from 100 to 150 μm.
14. The light-emitting device according to claim 9 , wherein the fluorescent layer contains the fluorescent substance at a concentration ranging from 50 to 60 wt %.
15. The light-emitting device according to claim 9 , wherein the light of the light-emitting element is a blue light and the fluorescent substance contains a yellow fluorescent substance.
16. The light-emitting device according to claim 15 , wherein the yellow fluorescent substance is an europium-activated alkaline earth metal silicate-based fluorescent substance.