Light-emitting element, light-emitting device, display device, electronic device, and lighting device

A light-emitting element comprising:

• a first electrode;
• a first light-emitting layer over the first electrode comprising:
• a first phosphorescent compound;
• and
• a first host material;
• a second light-emitting layer over the first light-emitting layer comprising:
• a second phosphorescent compound;
• and
• a second host material;
• a third light-emitting layer over the second light-emitting layer comprising:
• a third phosphorescent compound;
• and
• a third host material;
• and
• a second electrode over the third light-emitting layer,
• wherein the first phosphorescent compound emits blue light,
• wherein ε(λ)λ4 of the second phosphorescent compound has a peak within a wavelength range of 440 nm to 520 nm,
• wherein the second phosphorescent compound has a peak wavelength of phosphorescence within a range of 520 nm to 600 nm,
• wherein ε(λ)λ4 of the third phosphorescent compound has a peak within a wavelength range of 520 nm to 600 nm,
• wherein the third phosphorescent compound emits light with a wavelength longer than the wavelength of the light emitted from the second phosphorescent compound,
• wherein λ denotes a wavelength, and
• wherein ε(λ) denotes a molar absorption coefficient at the wavelength λ.

A light-emitting element comprising:

• a first electrode;
• a first light-emitting layer over the first electrode comprising:
• a first phosphorescent compound;
• and
• a first host material;
• a second light-emitting layer over the first light-emitting layer comprising:
• a second phosphorescent compound;
• and
• a second host material;
• a third light-emitting layer over the second light-emitting layer comprising:
• a third phosphorescent compound;
• and
• a third host material;
• and
• a second electrode over the third light-emitting layer,
• wherein the first phosphorescent compound has a peak wavelength of phosphorescence within a range of 440 nm to 520 nm,
• wherein ε(λ)λ4 of the second phosphorescent compound has a peak within a wavelength range of 440 nm to 520 nm,
• wherein the second phosphorescent compound has a peak wavelength of phosphorescence within a range of 520 nm to 600 nm,
• wherein ε(λ)λ4 of the third phosphorescent compound has a peak within a wavelength range of 520 nm to 600 nm,
• wherein λ denotes a wavelength, and
• wherein ε(λ) denotes a molar absorption coefficient at the wavelength λ.