| 摘要 |
A surface light-emitting element radiates light emitted to a side of a surface light-emitting device. The surface light-emitting device includes: a polygonal transparent substrate, and a light-emitting element disposed on one face of the transparent substrate. The light-emitting element is a laminated body including a transparent electrode which is positively charged and functions as an anode, a negative electrode which becomes negatively charged and functions as a cathode opposite the transparent electrode, and a light-emitting layer between the transparent electrode and a negative electrode. Lengths of respective sides and a thickness of the transparent substrate have a relationship that if b denotes the thickness of transparent substrate, dividing the lengths of the respective sides by 4b results in values ranging from 0.5 (inclusive) to 10 (inclusive).
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