| 摘要 |
A planar light emitting device 1 has a light emitting layer 5 that is formed on a glass substrate 2 and that emits light when a voltage is applied thereto or a current is injected thereinto and a two-dimensional diffraction grating 30 that has a first and a second medium 31 and 32 having different refractive indices and that has the second medium 32 arrayed two-dimensionally in the first medium 31. In the two-dimensional diffraction grating 30, the ratio of the area occupied by the second medium 32 to the sum of the area occupied by the first medium 31 and the area occupied by the second medium 32 is 25% or more but 60% or less.
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