Monoamine compound, charge-transporting material, and organic electroluminescent device

Abstract

The present invention provides an organic electroluminescent device exhibiting a long life, a high luminance, and a high efficiency. An organic electroluminescent device comprising on a substrate an anode, a hole transport layer, an organic light-emitting layer, and a cathode, wherein the organic light-emitting layer contains an organic compound having a pyridine ring, a pyrazine ring, or a triazine ring as a partial structure and the hole transport layer contains a monoamine compound represented by the following formula (I): wherein R 1 to R 9 represent a hydrogen atom, an aryl group, or an alkyl group; R 1 to R 9 may be the same or different from each other; and R 1 to R 9 may further have an aryl group or an alkyl group as a substituent in the case where R 1 to R 9 are an aryl group or an alkyl group.

1 . A monoamine compound represented by the following formula (II) and having a molecular weight of 400 to 2500: 
       
         
           
           
               
               
           
         
         wherein R 11  to R 22  represent a hydrogen atom, an aryl group, or an alkyl group; R 11  to R 22  may be the same or different from each other; provided that any one of R 11  to R 22  is an aryl group or an alkyl group; R 11  to R 22  may further have an aryl group or an alkyl group as a substituent in the case where R 11  to R 22  are an aryl group or an alkyl group; and R 11  to R 22  may be combined with an adjacent substituent to form a ring. 
       
     
     
         2 . The monoamine compound according to  claim 1 , wherein in the formula (II) above, R 11  to R 22  represent a hydrogen atom, an aryl group, or an alkyl group; R 11  to R 22  may be the same or different from each other; provided that any one of R 11  to R 22  represents a monovalent group formed by connecting 1 to 8 of benzene rings; R 11  to R 22  may further have an alkyl group having carbon atoms of 1 to 20 as a substituent in the case where R 11  to R 22  are an aryl group or an alkyl group; and R 11  to R 22  may be combined with an adjacent substituent to form a ring. 
     
     
         3 . The monoamine compound according to  claim 1 , wherein the above formula (II) is represented by the following formula (II-1): 
       
         
           
           
               
               
           
         
         wherein R 23  to R 26  represent a hydrogen atom, an aryl group, or an alkyl group; R 23  to R 26  may be the same or different from each other; provided that any one of R 23  to R 26  is an aryl group or an alkyl group; R 23  to R 26  may further have an aryl group or an alkyl group as a substituent in the case where R 23  to R 26  are an aryl group or an alkyl group; and R 23  to R 26  may be combined with an adjacent substituent to form a ring. 
       
     
     
         4 . A charge transporting material comprising the monoamine compound according to  claim 1 . 
     
     
         5 . A charge transporting material comprising the monoamine compound according to  claim 2 . 
     
     
         6 . A charge transporting material comprising the monoamine compound according to  claim 3 . 
     
     
         7 . An organic electroluminescent device comprising on a substrate an anode, an organic light-emitting layer, and a cathode, which has a layer containing the monoamine compound according to  claim 1  between the cathode and the anode. 
     
     
         8 . An organic electroluminescent device comprising on a substrate an anode, an organic light-emitting layer, and a cathode, which has a layer containing the monoamine compound according to  claim 2  between the cathode and the anode. 
     
     
         9 . An organic electroluminescent device comprising on a substrate an anode, an organic light-emitting layer, and a cathode, which has a layer containing the monoamine compound according to  claim 3  between the cathode and the anode.