Heterocyclic compound, light-emitting element, light-emitting device, electronic device, and lighting device

Abstract

To provide a novel heterocyclic compound that can be used as a host material in which a light-emitting substance of a light-emitting layer is dispersed. A heterocyclic compound comprising a dibenzo[f,h]quinoxaline ring and two hole-transport skeletons, where the dibenzo[f,h]quinoxaline ring and the two hole-transport skeletons are bonded to an aromatic hydrocarbon group. A heterocyclic compound represented by the following general formula (G1) is provided. Note that in the formula, A 1 and A 2 each independently represent any of a substituted or unsubstituted carbazole skeleton, a substituted or unsubstituted dibenzofuran skeleton, and a substituted or unsubstituted dibenzothiophen skeleton; B represents a substituted or unsubstituted dibenzo[f,h]quinoxaline skeleton; and Ar represents an arene skeleton having 6 to 13 carbon atoms. A light-emitting element including the heterocyclic compound is provided.

What is claimed is: 
     
         1 . A heterocyclic compound comprising:
 a dibenzo[f,h]quinoxaline ring;   a first hole-transport skeleton;   a second hole-transport skeleton; and   an aromatic hydrocarbon group,   wherein the dibenzo[f,h]quinoxaline ring, the first hole-transport skeleton and the second hole-transport skeleton are bonded to the aromatic hydrocarbon group.   
     
     
         2 . The heterocyclic compound according to  claim 1 ,
 wherein the aromatic hydrocarbon group is bonded to a 2-position of the dibenzo[f,h]quinoxaline ring.   
     
     
         3 . The heterocyclic compound according to  claim 1 ,
 wherein the first hole-transport skeleton includes a first it-electron rich heteroaromatic ring, and   wherein the second hole-transport skeleton includes a second π-electron rich heteroaromatic ring.   
     
     
         4 . The heterocyclic compound according to  claim 3 ,
 wherein the first π-electron rich heteroaromatic ring and the second π-electron rich heteroaromatic ring are each independently selected from any one of a carbazole ring, a dibenzofuran ring, and a dibenzothiophene ring.   
     
     
         5 . A light-emitting element comprising:
 a pair of electrodes; and   a layer containing an organic compound between the pair of electrodes,   wherein the layer containing the organic compound includes the heterocyclic compound according to  claim 1 .   
     
     
         6 . A light-emitting element according to  claim 5 , further comprising a phosphorescent compound as a guest material in the layer. 
     
     
         7 . A light-emitting element according to  claim 6 , wherein the phosphorescent compound have a diazine skeleton. 
     
     
         8 . A light-emitting device comprising the light-emitting element according to  claim 5 . 
     
     
         9 . A lighting device comprising the light-emitting element according to  claim 5 . 
     
     
         10 . An electronic device comprising the light-emitting element according to  claim 5 .