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

A light-emitting device comprising:

• a light-emitting layer between a pair of electrodes, the light-emitting layer comprising a fluorescent substance, a first organic compound, and a second organic compound,
• wherein:
• a HOMO level and LUMO level of the first organic compound are deeper than a HOMO level and LUMO level of the second organic compound,
• the second organic compound is represented by formula (G1):
• Ar1 and Ar2 each independently represent any one of a substituted or unsubstituted p-biphenyl group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted spirofluorenyl group, and a substituted or unsubstituted 4-(9-phenyl-9H-carbazol-3-yl)phenyl group;
• Ar3 represents an aryl group having 6 to 50 carbon atoms or a heteroaryl group having 1 to 50 carbon atoms;
• and
• light emission emitted from the light-emitting device includes a delayed fluorescence.

A light-emitting device comprising:

• a light-emitting layer between a pair of electrodes, the light-emitting layer comprising a fluorescent substance, a first organic compound, and a second organic compound,
• wherein:
• a HOMO level and LUMO level of the first organic compound are deeper than a HOMO level and LUMO level of the second organic compound,
• the second organic compound is represented by formula (100);
• and
• light emission emitted from the light-emitting device includes a delayed fluorescence.