Thiophene derivative and organic electroluminescent element

Abstract

The present invention provides a thiophene derivative useful for a material for forming an organic positive hole layer of an organic EL element excellent in light emitting efficiency, water resistance or the like, a polymer having the thiophene derivative as a monomer unit, and an organic EL element. The object can be solved by a thiophene derivative represented by the following formula (1), a polymer comprising the thiophene derivative, and an organic EL element, an organic positive hole transporting layer of which comprises the polymer: wherein, each “X” is a halogen atom, which may be same or different from each other; and “R” is an alkyl group.

1 . A thiophene derivative represented by the following formula (1):  
     
       
         
         
             
             
         
       
     
     wherein, each “X” is a halogen atom, which may be same or different from each other; and “R” is an alkyl group.  
   
   
       2 . A polymer represented by the following formula (2):  
     
       
         
         
             
             
         
       
     
     wherein, “R′” is a hydrogen atom, a counter ion constituting a salt or an alkyl group; “Y” is a divalent aromatic ring; “m” is an integer of 1 or larger; “n” is an integer of 0 or larger; and a repeating unit having a thiophene structure and a repeating unit containing “Y” in a polymer chain may be in any sequence.  
   
   
       3 . An organic electroluminescent element comprising at least a pair of electrodes, an organic positive hole transporting layer and an organic light emitting layer disposed between the pair of electrodes, wherein the organic positive hole transporting layer comprises the polymer defined by  claim 2.