Phosphorescent organometallic iridium complex, light-emitting element, light-emitting device, electronic device, and lighting device

A light-emitting device comprising a complex,

• wherein:
• the complex is represented by Formula (G1);
• R1 represents an alkyl group having 1 to 6 carbon atoms;
• and
• R2 to R10 independently represent hydrogen or an alkyl group having 1 to 6 carbon atoms.

A light-emitting device comprising a light-emitting layer,

• wherein:
• the light-emitting layer comprises a complex represented by Formula (G1) and a first organic compound;
• R1 represents an alkyl group having 1 to 6 carbon atoms;
• and
• R2 to R10 independently represent hydrogen or an alkyl group having 1 to 6 carbon atoms.

A light-emitting device comprising a first light-emitting layer and a second light-emitting layer over the first light-emitting layer,

• wherein:
• the first light-emitting layer comprises a first complex, a first compound, and a second compound;
• the second light-emitting layer comprises a second complex and the first compound;
• each of the first complex and the second complex is represented by Formula (G1);
• R1 represents an alkyl group having 1 to 6 carbon atoms;
• and
• R2 to R10 independently represent hydrogen or an alkyl group having 1 to 6 carbon atoms.