Light-emitting device
A highly reliable light-emitting device is provided, which is capable of effectively suppressing detrimental effects of sulfuric gas. A light-emitting device comprising a solid light-emitting element 1 , a metal member 2 reacting with sulfuric gas and a phosphor-containing layer 5 that contains a phosphor 3 , the phosphor-containing layer 5 containing a sulfuric gas-adsorbing substance 4 that adsorbs sulfuric gas, and, when the phosphor-containing layer 5 is tripartitioned from the side near the metal member to far into a proximal layer portion, an intermediate layer portion and an outer layer portion, the concentration of sulfuric gas-adsorbing substance 4 in the proximal layer portion is made to be higher than those for the intermediate layer portion and the outer layer portion.
1. A light emitting device comprising a solid light emitting element, a metal member reacting with sulfuric gas, and a phosphor-containing layer,
wherein the phosphor-containing layer contains a sulfide phosphor and a sulfuric gas absorbing substance absorbing the sulfuric gas, and when the phosphor-containing layer is tripartitioned from the side near the metal member to far into a proximal layer portion, an intermediate layer portion and an outer layer portion, the concentration of sulfuric gas-adsorbing substance in the proximal layer portion is higher than those in the intermediate layer portion and the outer layer portion.
2. The light emitting device according to claim 1 , wherein the sulfuric gas-adsorbing substance is a substance that can chemically adsorb sulfuric gas and moreover maintains transparency even if sulfurized.
3. The light emitting device according to claim 1 , wherein in the sulfuric gas absorbing substance, a value of L* after reaction with the sulfuric gas is not less than 60.
4. The light emitting device according to claim 1 , wherein the sulfuric gas-adsorbing substance is one species, two species or more selected from the group comprising ZnO-based compound, MgO-based compound, CaO-based compound, BaO-based compound, SrO-based compound and rare earth oxide.
5. The light emitting device according to claim 4 , wherein the sulfuric gas absorbing substance contains the ZnO-based compound which specific surface area is not less than 18 m 2 /g and not more than 40 m 2 /g.
6. The light emitting device according to claim 1 , wherein the sulfuric gas-adsorbing substance is a substance that can physically adsorb sulfuric gas and moreover maintains transparency even if sulfurized.
7. The light emitting device according to claim 6 , wherein the sulfuric gas-adsorbing substance in the sulfuric gas adsorption layer is a zeolite, a molecular sieve or both.
8. The light emitting device according to claim 1 , wherein the phosphor-containing layer is provided with a constitution of a sulfide phosphor dispersed within a resin.
9. The light emitting device according to claim 8 , wherein the resin is a silicone resin, an epoxy resin, an acrylic resin, an imide resin, or a urethane resin.
10. The light emitting device according to claim 1 , wherein the phosphor-containing layer and the sulfuric gas absorbing layer are formed through a heating process.
11. An illumination apparatus equipped with the light-emitting device according to claim 1 .
12. An optical apparatus equipped with the light-emitting device according to claim 1 .
13. A light emitting device comprising a solid light emitting element, a metal member reacting with sulfuric gas, and a phosphor-containing layer containing a sulfide phosphor and further comprising, between the metal member and the phosphor-containing layer, a sulfuric gas absorbing layer containing a sulfuric gas adsorbing substance adsorbing the sulfuric gas,
wherein the sulfuric gas absorbing layer comprises a resin and the sulfuric gas adsorbing substance, the resin is a silicone resin, an epoxy resin, an acrylic resin, an imide resin, or a urethane resin, and
the phosphor-containing layer is provided with a constitution of a sulfide phosphor dispersed within a resin, and the resin in the phosphor-containing layer and the resin in the sulfuric gas absorbing layer are the same resin.
14. A light emitting device comprising a configuration in which a sulfuric gas absorbing layer comprising a sulfuric gas adsorbing substance adsorbing the sulfuric gas and the resin covers a solid light emitting element and a metal member reacting with sulfuric gas, and the outside is covered by a phosphor-containing layer containing a sulfide phosphor and the resin,
wherein the sulfuric gas absorbing layer comprises a resin and the sulfuric gas adsorbing substance, the resin is a silicone resin, an epoxy resin, an acrylic resin, an imide resin, or a urethane resin, and
the phosphor-containing layer is provided with a constitution of a sulfide phosphor dispersed within a resin, and the resin in the phosphor-containing layer and the resin in the sulfuric gas absorbing layer are the same resin.
15. The light emitting device according to claim 13 , wherein the sulfuric gas-adsorbing substance is a substance that can chemically adsorb sulfuric gas and moreover maintains transparency even if sulfurized.
16. The light emitting device according to claim 14 , wherein the sulfuric gas-adsorbing substance is a substance that can chemically adsorb sulfuric gas and moreover maintains transparency even if sulfurized.
17. The light emitting device according to claim 13 , wherein in the sulfuric gas absorbing substance, a value of L* after reaction with the sulfuric gas is not less than 60.
18. The light emitting device according to claim 14 , wherein in the sulfuric gas absorbing substance, a value of L* after reaction with the sulfuric gas is not less than 60.
19. The light emitting device according to claim 13 , wherein the sulfuric gas-adsorbing substance is one species, two species or more selected from the group comprising ZnO-based compound, MgO-based compound, CaO-based compound, BaO-based compound, SrO-based compound and rare earth oxide.
20. The light emitting device according to claim 14 , wherein the sulfuric gas-adsorbing substance is one species, two species or more selected from the group comprising ZnO-based compound, MgO-based compound, CaO-based compound, BaO-based compound, SrO-based compound and rare earth oxide.
21. The light emitting device according to claim 19 or 20 , wherein the sulfuric gas absorbing substance contains the ZnO-based compound which specific surface area is not less than 18 m 2 /g and not more than 40 m 2 /g.
22. The light emitting device according to claim 13 , wherein the sulfuric gas-adsorbing substance is a substance that can physically adsorb sulfuric gas and moreover maintains transparency even if sulfurized.
23. The light emitting device according to claim 14 , wherein the sulfuric gas-adsorbing substance is a substance that can physically adsorb sulfuric gas and moreover maintains transparency even if sulfurized.
24. The light emitting device according to claim 22 or 23 , wherein the sulfuric gas-adsorbing substance in the sulfuric gas adsorption layer is a zeolite, a molecular sieve or both.
25. The light emitting device according to claim 13 , wherein the phosphor-containing layer and the sulfuric gas absorbing layer are formed through a heating process.
26. The light emitting device according to claim 14 , wherein the phosphor-containing layer and the sulfuric gas absorbing layer are formed through a heating process.
27. An illumination apparatus equipped with the light-emitting device according to claim 13 .
28. An optical apparatus equipped with the light-emitting device according to claim 13 .
29. An illumination apparatus equipped with the light-emitting device according to claim 14 .
30. An optical apparatus equipped with the light-emitting device according to claim 14 .