Triarylamine Derivative, Light-Emitting Substance, Light-Emitting Element, Light-Emitting Device, And Electronic Device

A light-emitting device comprising:

• a first electrode;
• a second electrode;
• a light-emitting layer between the first electrode and the second electrode;
• and
• a layer comprising a compound between the first electrode and the light-emitting layer,
• wherein the light-emitting layer comprises a fluorescent light-emitting substance having an emission wavelength of 450 nm or more,
• wherein the layer is in contact with the light-emitting layer,
• wherein the compound is represented by a general formula (G1),
• wherein Ar represents any one of substituents represented by structural formulae (Ar-1) to (Ar-4),
• wherein α represents a first naphthyl group,
• wherein when the first naphthyl group has a substituent, the substituent is an alkyl group having 1 to 6 carbon atoms or a phenyl group,
• wherein β represents hydrogen or a second naphthyl group,
• wherein when the second naphthyl group has a substituent, the substituent is an alkyl group having 1 to 6 carbon atoms or a phenyl group,
• wherein n and m each independently represent 1 or 2, and
• wherein R1 to R8 each independently represent any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, and a phenyl group.

A light-emitting device comprising:

• a first electrode;
• a second electrode;
• a light-emitting layer between the first electrode and the second electrode;
• and
• a layer comprising a compound between the first electrode and the light-emitting layer,
• wherein the light-emitting layer comprises a phosphorescent light-emitting substance having an emission wavelength of 470 nm or more,
• wherein the layer is in contact with the light-emitting layer,
• wherein the compound is represented by a general formula (G1),
• wherein Ar represents any one of substituents represented by structural formulae (Ar-1) to (Ar-4),
• wherein α represents a first naphthyl group,
• wherein when the first naphthyl group has a substituent, the substituent is an alkyl group having 1 to 6 carbon atoms or a phenyl group,
• wherein β represents hydrogen or a second naphthyl group,
• wherein when the second naphthyl group has a substituent, the substituent is an alkyl group having 1 to 6 carbon atoms or a phenyl group,
• wherein n and m each independently represent 1 or 2, and
• wherein R1 to R8 each independently represent any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, and a phenyl group.

A light-emitting device comprising:

• a first electrode;
• a second electrode;
• a light-emitting layer between the first electrode and the second electrode;
• and
• a layer comprising a compound between the first electrode and the light-emitting layer,
• wherein the light-emitting layer comprises a light-emitting substance comprising iridium,
• wherein the layer is in contact with the light-emitting layer,
• wherein the compound is represented by a general formula (G1),
• wherein Ar represents any one of substituents represented by structural formulae (Ar-1) to (Ar-4),
• wherein α represents a first naphthyl group,
• wherein when the first naphthyl group has a substituent, the substituent is an alkyl group having 1 to 6 carbon atoms or a phenyl group,
• wherein β represents hydrogen or a second naphthyl group,
• wherein when the second naphthyl group has a substituent, the substituent is an alkyl group having 1 to 6 carbon atoms or a phenyl group,
• wherein n and m each independently represent 1 or 2, and
• wherein R1 to R8 each independently represent any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, and a phenyl group.