The present invention provides a white organic light-emitting element high
in the emission efficiency. In particular, the invention provides a white
organic light-emitting element that has an emission spectrum having peaks
in the respective wavelength regions of red color, green color and blue
color and is high in the emission efficiency.Since a spectrum region
lowest in the emission efficiency is a red region, by introducing a
reddish phosphorescent material, a highly efficient white organic
light-emitting element is obtained. At this time, in order to inhibit the
reddish phosphorescent material from singularly emitting, as shown in
FIG. 1, a distance between a second emission region 114 where a reddish
phosphorescent material 124 is a luminescent material and a first
emission region 113 that exhibits emission in a shorter wavelength side
than the second emission region is separated. In a configuration shown in
FIG. 1, it is preferable to use an electron transport material in a layer
115 between the first emission region and the second emission region and
more preferable to use a hole block material.