Patent ID: 8680543

Claim:
A light emitting device comprising: a plurality of light emitting elements, each of which comprises a first electrode; a second electrode configured to transmit light; an organic layer arranged between the first electrode and the second electrode and comprising a light emitting layer; and a capping layer arranged on the second electrode and made of a material with a higher refractive index than the refractive index of the material constituting the second electrode and with a bandgap of 3.2 eV or higher, wherein the material constituting the capping layer comprises at least one compound selected from the group consisting of a triarylamine derivative, a carbazole derivative, a benzimidazole derivative and a triazole derivative, wherein the capping layer is arranged so that the second electrode is arranged between the organic layer and the capping layer, wherein the light emitting elements are classified into a first light emitting element emitting red light, a second light emitting element emitting green light, and a third light emitting element emitting blue light, wherein the thickness of the capping layer of the first light emitting element (d 1 +d 2 ), the thickness of the capping layer of the second light emitting element (d 1 ), and the thickness of the capping layer of the third light emitting element (d 2 ) satisfy the formula d 1 >d 2 , and wherein the thickness of the capping layer of the first light emitting element (d 1 +d 2 ) is within 10% with respect to the sum of the thickness of the capping layer of the second light emitting element (d 1 ) and the thickness of the capping layer of the third light emitting element (d 2 ).