Patent ID: 8564191

Claim:
Alight emitting substrate, comprising: a transparent substrate; a photonic crystal structure; a transparent anode; a light emitting layer having a diffuse reflectance of 0.04% or less and having a side reflecting member at a side thereof, wherein the photonic crystal structure, the transparent anode, and the light emitting layer are successively laminated in this order on the transparent substrate, wherein the light emitting substrate satisfies the following Condition 1 or Condition 2: Condition 1: 95%≦c, and 40% ≦a<100% Condition 2: 85%≦c<95%, and 80% ≦a<100% where parameter “a” represents a relative area defined based on a ratio of an area S 2 of a diffractive region of the photonic crystal structure to an area S 1 of the light emitting layer such that the parameter a=S 2 /S 1 , and parameter “c” represents a reflectance of the side reflecting member.