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

A light-emitting device comprising:

• a substrate;
• an anode over the substrate;
• a first light-emitting layer over the anode, the first light-emitting layer comprising a first compound and a first host material;
• a second light-emitting layer over and in contact with the first light-emitting layer, the second light-emitting layer comprising a second compound and a second host material;
• and
• a cathode over the first light-emitting layer,
• wherein the first host material comprises a first host compound,
• wherein the second host material comprises a second host compound and a third host compound,
• wherein an emission wavelength of the first compound is longer than an emission wavelength of the second compound,
• wherein a triplet excitation energy of the second host compound is higher than or equal to a triplet excitation energy of the first host compound,
• wherein the second host compound is configured to form a first exciplex with the third host compound,
• wherein a difference in energy between an emission peak wavelength of the first exciplex and a peak wavelength of a lowest-energy absorption band of the second compound is 0.2 eV or less, and
• wherein at least one of the first compound and the second compound is a phosphorescent compound.