An electroluminescent device includes, for example, first to third optical
output parts respectively corresponding to red, green, and blue colors
and each having a light-emitting layer. A visibility spectrum curve has
an inclination value corresponding to the first optical output part, an
inclination value corresponding to the second optical output part, and an
inclination value corresponding to the third optical output part. Each
inclination value corresponds to an emission peak wavelength at which an
emission spectrum of a light ray emitted from the light-emitting layer of
the corresponding optical output part reaches a maximum intensity value.
The inclination values have the following relationship: first optical
output part>second optical output part>third optical output part.
The emission spectra of the optical output parts have widths in the
following relationship: first optical output part>second optical
output part>third optical output part.