Patent ID: 8809882

Claim:
A light emitting element comprising: an organic layer that sequentially includes a first emission layer and a second emission layer which are interposed between a first electrode and a second electrode, and emit light of a single color or two or more different colors, at positions spaced apart from each other in the direction of the second electrode from the first electrode; a first reflection interface that is provided on the first electrode side, and reflects light emitted from the first emission layer and the second emission layer so as to be output from the second electrode side; and a second reflection interface that is provided on the second electrode side, wherein, when an optical distance between the first reflection interface and an emission center of the first emission layer is L 11 , an optical distance between the first reflection interface and an emission center of the second emission layer is L 21 , an optical distance between the emission center of the first emission layer and the second reflection interface is L 12 , an optical distance between the emission center of the second emission layer and the second reflection interface is L 22 , a central wavelength of an emission spectrum of the first emission layer is λ 1 , and a central wavelength of an emission spectrum of the second emission layer is λ 2 , the optical distances L 11 , L 21 , L 12 and L 22 satisfy all the following expressions (1) to (8). 2 L 11/λ11+φ1/2π=0 (1) 2 L 21/λ21+φ1/2π= n (where n≧1) (2) λ1<λ11<λ1+200 (3) λ2−40<λ21<λ2+40 (4) 2 L 12/λ12+φ2/2π= m′ (5) 2 L 22/λ22+φ2/2π= n′+ 1/2 (6) λ1−100<λ12<λ1 (7) λ2−15<λ22<λ2+15 (8) where n, m′ and n′ are integers, the unit of each of λ 1 , λ 2 , λ 11 , λ 21 , λ 12 , and μ 22 is nm, φ 1 indicates a phase variation when light of each wavelength is reflected by the first reflection interface, and φ 2 indicates a phase variation when light of each wavelength is reflected by the second reflection interface.