Patent ID: 8283055

Claim:
A light-emitting device comprising: a first electrode; a first light-emitting unit over the first electrode; a charge generation layer over the first light-emitting unit; a second light-emitting unit over the charge generation layer; and a second electrode over the second light-emitting unit, wherein the first light-emitting unit comprises a material represented by a general formula (G1), and wherein: Ar 1 represents a substituted or unsubstituted aryl group having 6 to 13 carbon atoms; Ar 2 , Ar 3 , and Ar 4 each independently represent a substituted or unsubstituted arylene group having 6 to 13 carbon atoms; R 1 to R 8 independently represent hydrogen or an alkyl group having 1 to 4 carbon atoms; R 11 represents an alkyl group having 1 to 4 carbon atoms or a substituted or unsubstituted aryl group having 6 to 13 carbon atoms; and R 12 represents an alkyl group having 1 to 4 carbon atoms or a substituted or unsubstituted aryl group having 6 to 13 carbon atoms.