Stilbene derivative, light-emitting element, light-emitting device, and electronic device

A light-emitting element comprising:

• a pair of electrodes;
• and
• a light-emitting layer between the pair of electrodes,
• wherein the light-emitting layer comprises a stilbene derivative expressed by a general formula (2),
• wherein R1 to R3 each represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and
• wherein A represents a substituent expressed by the structural formula (3) or the structural formula (4), and Ar2 represents one of an unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, or a substituted or unsubstituted terphenyl group.

A light-emitting element comprising:

• a pair of electrodes;
• and
• a light-emitting layer between the pair of electrodes,
• wherein the light-emitting layer comprises a stilbene derivative expressed by a general formula (5),
• wherein R1 to R3 each represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and
• wherein A represents a substituent expressed by the structural formula (6) or the structural formula (7), and B represents a hydrogen atom or a substituent expressed by the structural formula (6) or the structural formula (7).

A light-emitting element comprising:

• a pair of electrodes;
• and
• a light-emitting layer between the pair of electrodes,
• wherein the light-emitting layer comprises a stilbene derivative expressed by a general formula (8),
• wherein R1 to R3 each represent a hydrogen atom, or an alkyl group having 1 to 3 carbon atoms.

A light-emitting element comprising:

• a pair of electrodes;
• and
• a light-emitting layer between the pair of electrodes,
• wherein the light-emitting layer comprises a stilbene derivative expressed by a structural formula (9)