Light emitting device and resin composition

Abstract

Provided a light emitting device comprising: a package; a light emitting element disposed in the package; an encapsulation member that covers the light emitting element, the encapsulation member being formed from a resin composition that contains a fluorescent material, a resin, and nanoparticles selected from at least one of the group consisting of aluminum oxide nanoparticles, titanium oxide nanoparticles, zinc oxide nanoparticles, zirconium oxide nanoparticles, and silicon oxide nanoparticles, wherein when the resin composition includes silicon oxide nanoparticles, the content of the silicon oxide nanoparticles is 0.02 to 5 mass parts relative to 100 mass parts of the resin; and wherein the fluorescent material includes a Mn4+ activated red-light emitting fluorescent material having a chemical composition represented by the formula (I): A2[M1-xMn4+xF6]  (I) wherein A is at least one cation selected from the group consisting of K+, Li+, Na+, Rb+, Cs+, and NH4+; M is at least one element selected from the group consisting of elements from Group 4 of the periodic table and elements from Group 14 of the periodic table, and x satisfies 0<x<0.2, and having a surface region with a lower tetravalent manganese ion concentration than the inner region of the fluorescent material.

Dependencies are inferred from the claim text.