Patent ID: 8232572

Claim:
A light emitting device comprising: a first electrode; a second electrode provided on a light extraction side; an emission layer formed between the first electrode and the second electrode; a reflection surface located on the first electrode side with respect to the emission layer; and a periodic structure for diffracting light generated in the emission layer and guided in an in-plane direction of the light emitting device to the light extraction side, wherein the periodic structure is a fixed end and is formed at a node of interference generated by light emitted from the emission layer to the light extraction side and light emitted from the emission layer to the reflection surface side and reflected on the reflection surface, and wherein a height h of the periodic structure satisfies: h < λ 4 ⁢ n where λ represents a peak wavelength of a spectrum of the diffraction light and n represents an average refractive index between the periodic structure and the reflection surface.