| 摘要 |
PROBLEM TO BE SOLVED: To provide an organic electroluminescent element ensuring high visibility of a transmission image, and to provide an illuminating device and an illumination system.SOLUTION: An organic electroluminescent element having a first electrode, an organic light-emitting layer, and a second electrode is provided. The first electrode has an upper surface, and transmits light. The organic light-emitting layer is provided on the first electrode. The second electrode is provided on the organic light-emitting layer, and includes a plurality of conductive parts extending in a first direction parallel with the upper surface and arranged in a second direction parallel with the upper surface and crossing the first direction, and reflecting light. Following relationship is satisfied; W1≥-647(1-W1/P1)+511, where W1 (micrometer) is the length of each of the plurality of conductive parts in the second direction, and P1 (micrometer) is the pitch of the plurality of conductive parts. |
