Heterocyclic Compound, Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device

Abstract

In General Formula (G1), each of A1 and A2 independently represents nitrogen or carbon bonded to hydrogen, and at least one of A1 and A2 represents nitrogen; Ar represents a substituted or unsubstituted arylene group having 6 to 18 carbon atoms; B represents a substituted or unsubstituted fluorenyl group; and R1 represents hydrogen, an alkyl group having 1 to 6 carbon atoms, or an aryl group having 6 to 13 carbon atoms.

What is claimed is: 
     
         1 . A light-emitting element comprising:
 a pair of electrodes;   an electroluminescent layer between the pair of electrodes;   a light-emitting layer in the electroluminescent layer;   a first layer on the light-emitting layer; and   a second layer on the first layer,   wherein the light-emitting layer comprises a phosphorescent substance, and   wherein the first layer comprises a heterocyclic compound,
 wherein the heterocyclic compound has an aryl group bonding to a triazine skeleton and the triazine skeleton bonding to a fluorene skeleton through an arylene group. 
   
     
     
         2 . The light-emitting element according to  claim 1 , wherein the fluorene skeleton is a substituted or unsubstituted 2-fluorenyl group. 
     
     
         3 . The light-emitting element according to  claim 2 , wherein the substituted or unsubstituted 2-fluorenyl group is represented by a formula (α): 
       
         
           
           
               
               
           
         
         wherein each of R 11  to R 19  independently represents one of hydrogen, an alkyl group having 1 to 6 carbon atoms, and an aryl group having 6 to 12 carbon atoms. 
       
     
     
         4 . The light-emitting element according to  claim 3 , wherein the substituted or unsubstituted 2-fluorenyl group is represented by a formula (β): 
       
         
           
           
               
               
           
         
         wherein each of R 17  and R 18  independently represents one of hydrogen, an alkyl group having 1 to 6 carbon atoms, and an aryl group having 6 to 12 carbon atoms. 
       
     
     
         5 . The light-emitting element according to  claim 1 , wherein the aryl group has 6 to 13 carbon atoms. 
     
     
         6 . The light-emitting element according to  claim 5 , wherein the aryl group is a phenyl group. 
     
     
         7 . The light-emitting element according to  claim 1 , wherein the arylene group is a substituted or unsubstituted arylene group having 6 to 18 carbon atoms. 
     
     
         8 . The light-emitting element according to  claim 7 , wherein the arylene group is a biphenylene group. 
     
     
         9 . The light-emitting element according to  claim 1 , wherein the second layer comprises a substance having an electron-transport property. 
     
     
         10 . A light-emitting device comprising the light-emitting element according to  claim 1 , comprising at least one of a transistor and a substrate. 
     
     
         11 . An electronic device comprising the light-emitting device according to  claim 10 , comprising at least one of a microphone, a camera, an operation button, an external connection portion, and a speaker. 
     
     
         12 . A lighting device comprising the light-emitting device according to  claim 10 , comprising at least one of a housing, a cover, and a support base.