Triazole derivative, and light-emitting element, light-emitting device, electronic device and lighting device using the triazole derivative

摘要

Objects are to provide the following: a substance that facilitates hole injection and has high triplet excitation energy; a light-emitting element having high emission efficiency using the substance that facilitates hole injection and has high triplet excitation energy; a light-emitting element having low driving voltage; and a light-emitting device, an electronic device, and a lighting device having low power consumption. Provided is a triazole derivative in which a dibenzothiophen-4-yl or dibenzofuran-4-yl group represented by General Formula (G2) is bonded to any one of Ar1 to Ar3 of a triazole derivative represented by General Formula (G1). In the formulas, A represents oxygen or sulfur, Ar1 to Ar3 separately represent a substituted or unsubstituted aryl group having 6 to 13 carbon atoms, and R1 to R7 separately represent hydrogen, an alkyl group having 1 to 4 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 13 carbon atoms.;

主权项

1. A light-emitting element comprising:
a pair of electrodes; and a light-emitting layer between the pair of electrodes, the light-emitting layer comprising a first triazole derivative and a light-emitting substance, wherein the first triazole derivative is represented by General Formula (G1), wherein a substituent represented by General Formula (G2) is bonded to one of Ar1 and Ar2, and wherein: A represents sulfur; the one of Ar1 and Ar2 represents a substituted or unsubstituted arylene group having 6 to 13 carbon atoms; the other of Ar1 and Ar2, and Ar3 which are not bonded to the substituent separately represent a substituted or unsubstituted aryl group having 6 to 13 carbon atoms; and R1 to R7 separately represent hydrogen, an alkyl group having 1 to 4 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 13 carbon atoms.