| abstract |
A layer including an organic compound at least includes a layer serving as a light-emitting layer in which a first layer, a second layer, a third layer, and a fourth layer are stacked in that order over an anode. The first layer includes a first light-emitting substance, the second layer includes a second light-emitting substance, the third layer includes a third light-emitting substance, and the fourth layer includes a fourth light-emitting substance. Emission peak wavelengths of the first light-emitting substance and the fourth light-emitting substance are shorter than an emission peak wavelength of the third light-emitting substance, and the emission peak wavelength of the third light-emitting substance is shorter than an emission peak wavelength of the second light-emitting substance. Each of the first layer, the second layer, and the third layer has a hole-transporting property, and the fourth layer has an electron-transporting property. |