Quinoxaline Derivative, and Light-Emitting Device, Electronic Device Using the Quinoxaline Derivative

Abstract

The present invention provides a novel organic compound having excellent heat resistance. By using the novel organic compound, a light-emitting device and an electronic device having excellent heat resistance can be provided. A quinoxaline derivative represented by the general formula (1) is provided. Since the quinoxaline derivative represented by the general formula (1) has excellent heat resistance, when it is used for a light-emitting element, a light-emitting device using the light-emitting element also have excellent heat resistance. Further, electronic devices having excellent heat resistance can be provided.

1 - 22 . (canceled) 
     
     
         23 . A compound comprising:
 a quinoxaline skeleton; and   two carbazole skeletons each having a substituted or unsubstituted phenyl group,   wherein each of the two carbazole skeletons is bonded to the quinoxaline skeleton though an arylene group having 6 to 25 carbon atoms, and   wherein the compound has an emission wavelength peak at approximately 448 nm in a solution comprising toluene.   
     
     
         24 . The compound according  claim 23 , wherein the compound is represented by a general formula (1); 
       
         
           
           
               
               
           
         
         wherein R 1  to R 4  each represent one of a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, and an aryl group having 6 to 25 carbon atoms, 
         wherein Ar 1  and Ar 2  each are represented by a general formula (2), 
       
       
         
           
           
               
               
           
         
         wherein R 5  to R 9  each represent one of a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, and an aryl group having 6 to 15 carbon atoms, and 
         wherein α represents an arylene group having 6 to 25 carbon atoms. 
       
     
     
         25 . The compound according to  claim 24 ,
 wherein α represents a phenylene group.   
     
     
         26 . The compound according to  claim 24 ,
 wherein α represents a phenylene group,   wherein R 1  to R 8  each represent a hydrogen atom.   
     
     
         27 . The compound according to  claim 24 ,
 wherein at least one of the pairs R 1  and R 2 , R 2  and R 3 , and R 3  and R 4  is bound to each other to form a ring.   
     
     
         28 . A light-emitting element comprising:
 a pair of electrodes; and   a light-emitting layer comprising a compound according to  claim 24  between the pair of electrodes.   
     
     
         29 . The light-emitting element according to  claim 28 ,
 wherein the light-emitting layer further comprises one of a fluorescent substance and a phosphorescent substance.   
     
     
         30 . The light-emitting element according to  claim 28 ,
 wherein the light-emitting layer further comprises a phosphorescent substance,   wherein a peak of an emission spectrum of the phosphorescent substance is located in a range of 560 nm to 700 nm.   
     
     
         31 . The light-emitting element according to  claim 28 ,
 wherein the light-emitting element emits light of blue to blue green.   
     
     
         32 . The light-emitting element according to  claim 28 ,
 wherein at least one of the pair of electrodes is capable of transmitting light.   
     
     
         33 . A compound comprising:
 a quinoxaline skeleton; and   two carbazole skeletons each having a substituted or unsubstituted phenyl group,   wherein each of the two carbazole skeletons is bonded to the quinoxaline skeleton though an arylene group having 6 to 25 carbon atoms, and   wherein the compound has an absorption peak at approximately 360 nm in a solution comprising toluene.   
     
     
         34 . The compound according  claim 33 , wherein the compound is represented by a general formula (1); 
       
         
           
           
               
               
           
         
         wherein R 1  to R 4  each represent one of a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, and an aryl group having 6 to 25 carbon atoms, 
         wherein Ar 1  and Ar 2  each are represented by a general formula (2), 
       
       
         
           
           
               
               
           
         
         wherein R 5  to R 9  each represent one of a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, and an aryl group having 6 to 15 carbon atoms, and 
         wherein α represents an arylene group having 6 to 25 carbon atoms. 
       
     
     
         35 . The compound according to  claim 34 ,
 wherein α represents a phenylene group.   
     
     
         36 . The compound according to  claim 34 ,
 wherein α represents a phenylene group,   wherein R 1  to R 8  each represent a hydrogen atom.   
     
     
         37 . The compound according to  claim 34 ,
 wherein at least one of the pairs R 1  and R 2 , R 2  and R 3 , and R 3  and R 4  is bound to each other to form a ring.   
     
     
         38 . A light-emitting element comprising:
 a pair of electrodes; and   a light-emitting layer comprising a compound according to  claim 34  between the pair of electrodes.   
     
     
         39 . The light-emitting element according to  claim 38 ,
 wherein the light-emitting layer further comprises one of a fluorescent substance and a phosphorescent substance.   
     
     
         40 . The light-emitting element according to  claim 38 ,
 wherein the light-emitting layer further comprises a phosphorescent substance,   wherein a peak of an emission spectrum of the phosphorescent substance is located in a range of 560 nm to 700 nm.   
     
     
         41 . The light-emitting element according to  claim 38 ,
 wherein the light-emitting element emits light of blue to blue green.   
     
     
         42 . The light-emitting element according to  claim 38 ,
 wherein at least one of the pair of electrodes is capable of transmitting light.