A carbazole compound represented by General Formula (G1) is provided.
In the formula, α represents a phenylene group, Ar
1
represents an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, or a substituted or unsubstituted phenanthryl group, Ar
2
represents hydrogen, a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, or a substituted or unsubstituted phenanthryl group, Ar
3
represents a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, or a substituted or unsubstituted phenanthryl group, and R
1
represents hydrogen, an alkyl group having 1 to 6 carbon atoms, or a substituted or unsubstituted phenyl group. Further, n is 0 or 1.
A light-emitting element is disclosed where a host material and a hole-transport material each consist of a carbazole skeleton and another skeleton other than the carbazole skeleton. Both the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of the hole-transport material are distributed over the carbazole skeleton, while the HOMO of the host material is distributed over the carbazole skeleton and the LUMO thereof is distributed over the skeleton other than the carbazole skeleton. This combination of the hole-transport material and the host material allows the fabrication of a light-emitting element with high emission efficiency and low driving voltage.
An object is to provide a light-emitting element having high light-emission efficiency by provision of a novel fluorene derivative as represented by General. Formula (G1) below.
In the formula, R
1
to R
8
independently represent any of a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted biphenyl group. Further, α
1
to α
4
independently represent any of a substituted or unsubstituted arylene group having 6 to 12 carbon atoms. Furthermore, Ar
1
and Ar
2
independently represent any of an aryl group having 6 to 13 carbon atoms in a ring and Ar
3
represents an alkyl group having 1 to 6 carbon atoms or a substituted or unsubstituted aryl group having 6 to 12 carbon atoms. J, k, m, and n each independently represent 0 or 1.
An object is to provide a light-emitting element having high light-emission efficiency by provision of a novel fluorene derivative as represented by General Formula (G1) below.
In the formula, R1 to R8 independently represent any of a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted biphenyl group. Further, α1 to α4 independently represent any of a substituted or unsubstituted arylene group having 6 to 12 carbon atoms. Furthermore, Ar1 and Ar2 independently represent any of an aryl group having 6 to 13 carbon atoms in a ring and Ar3 represents an alkyl group having 1 to 6 carbon atoms or a substituted or unsubstituted aryl group having 6 to 12 carbon atoms. J, k, m, and n each independently represent 0 or 1.
An object is to provide a light-emitting element having high light-emission efficiency by provision of a novel fluorene derivative as represented by General Formula (G1) below
In the formula, R1 to R8 independently represent any of a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted biphenyl group. Further, α1 to α4 independently represent any of a substituted or unsubstituted arylene group having 6 to 12 carbon atoms. Furthermore, Ar1 and Ar2 independently represent any of an aryl group having 6 to 13 carbon atoms in a ring and Ar3 represents an alkyl group having 1 to 6 carbon atoms or a substituted or unsubstituted aryl group having 6 to 12 carbon atoms. J, k, m, and n each independently represent 0 or 1.