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

A light-emitting device comprising first to third light-emitting elements and first to third optical elements,

• wherein a spectrum of light emitted from the first light-emitting element through the first optical element has a first local maximum value in a wavelength range of greater than or equal to 600 nm and less than or equal to 740 nm,
• wherein a spectrum of light emitted from the second light-emitting element through the second optical element has a second local maximum value in a wavelength range of greater than or equal to 480 nm and less than 550 nm,
• wherein a spectrum of light emitted from the third light-emitting element through the third optical element has a third local maximum value in a wavelength range of greater than or equal to 400 nm and less than 480 nm,
• wherein at least one of the first to third fourth-emitting elements comprises:
• a first electrode and a second electrode;
• and
• a first light emitting layer and a second light emitting layer between the first electrode and the second electrode,
• wherein the first light emitting layer is configured to emit light by triplet-triplet annihilation, and
• wherein the second light emitting layer is configured to emit light by exciplex-triplet energy transfer.

A light-emitting device comprising first to fourth light-emitting elements and first to third optical elements,

• wherein a spectrum of light emitted from the first light-emitting element through the first optical element has a first local maximum value in a wavelength range of greater than or equal to 600 nm and less than or equal to 740 nm,
• wherein a spectrum of light emitted from the second light-emitting element through the second optical element has a second local maximum value in a wavelength range of greater than or equal to 480 nm and less than 550 nm,
• wherein a spectrum of light emitted from the third light-emitting element through the third optical element has a third local maximum value in a wavelength range of greater than or equal to 400 nm and less than 480 nm,
• wherein a spectrum of light emitted from the fourth light-emitting element has a fourth local maximum value in a wavelength range of greater than or equal to 550 nm and less than 600 nm,
• wherein at least one of the first to fourth light-emitting elements comprises:
• a first electrode and a second electrode;
• and
• a first light emitting layer and a second light emitting layer between the first electrode and the second electrode,
• wherein the first light emitting layer is configured to emit light by triplet-triplet annihilation, and
• wherein the second light emitting layer is configured to emit light by exciplex-triplet energy transfer.