Oligoarylene Derivatives and Organic Electroluminescent Devices Made By Using The Same

Abstract

There are provided oligoarylene derivatives capable of emitting blue light at high luminous efficiency which are represented by the following general formulae (1) to (4): Ar 1 −Ch−Ar 2   (1) Ch 1 −L−Ch 2   (2) Ar 3 −( L 1 ) a −Ch 3 −( L 2 ) b −Ar 4   (3) Ar 5 −Ch 4 −( Ar 7 ) n −L 3 −( Ar 8 ) m −Ch 5 −Ar 6   (4) wherein Ch, Ch 1 and Ch 2 are respectively a group containing at least one substituted or unsubstituted condensed aromatic ring having 14 to 20 nuclear atoms; Ch 3 , Ch 4 and Ch 5 are respectively a substituted or unsubstituted arylene group having 14 to 20 nuclear atoms; Ar 1 , Ar 2 , Ar 3 , Ar 4 , Ar 5 and Ar 6 are respectively a substituted or unsubstituted aryl group having 5 to 30 nuclear atoms; Ar 7 and Ar 8 are respectively a substituted or unsubstituted arylene group having 5 to 30 nuclear atoms; L 1 , L 2 and L 3 are respectively a connecting group; and a, b, n and m are respectively an integer of 0 to 1, as well as organic electroluminescent devices using the same.

1 . An oligoarylene derivative represented by the following general formula (2):
     Ch   1   −L−Ch   2   (2)   
     wherein L is a connecting group; and Ch 1  and Ch 2  are respectively a group containing at least one substituted or unsubstituted condensed aromatic ring having 14 to 20 nuclear carbon atoms and may be the same or different from each other. 
   
   
       2 . An oligoarylene derivative represented by the following general formula (4):
     Ar   5   −Ch   4 −(Ar 7 ) n   −L   3 −( Ar   8 ) m   −Ch   5   −Ar   6   (4)   
     wherein L 3  is a connecting group; Ch 4  and Ch 5  are respectively a substituted or unsubstituted arylene group having 14 to 20 nuclear atoms and may be the same or different from each other;
 Ar 5  and Ar 6  are respectively a substituted or unsubstituted aryl group having 5 to 30 nuclear atoms and may be the same or different from each other; 
 Ar 7  and Ar 8  are respectively a substituted or unsubstituted arylene group having 5 to 30 nuclear atoms and may be the same or different from each other; and n and m are respectively an integer of 0 to 1. 
 
   
   
       3 . The oligoarylene derivative according to  claim 1 , wherein the condensed aromatic ring in general formula (2) is selected from the group consisting of phenanthrene, pyrene, chrysene, triphenylene and perylene. 
   
   
       4 . The oligoarylene derivative according to  claim 2 , wherein the arylene group in Ch 4  and Ch 5  of the general formula (4) is a group selected from the group consisting of phenanthrylene, pyrenylene, chrysenylene, triphenylenylene and perylenylene. 
   
   
       5 . The oligoarylene derivative according to  claim 1 , wherein the oligoarylene derivative is used as a luminescent material for organic electroluminescent devices. 
   
   
       6 . The oligoarylene derivative according to  claim 1 , wherein the oligoarylene derivative is used as a hole transport material for organic electroluminescent devices. 
   
   
       7 . An organic electroluminescent device comprising a cathode, an anode and an organic thin film layer sandwiched between the cathode and the anode which is constituted of a single layer or a plurality of layers including at least one luminescent layer, wherein at least one layer of the organic thin film layer contains the oligoarylene derivative as claimed in  claim 1  as a single component or a component of a mixture. 
   
   
       8 . The organic electroluminescent device according to  claim 7 , wherein the luminescent layer contains the oligoarylene derivative. 
   
   
       9 . The organic electroluminescent device according to  claim 7 , wherein the luminescent layer consists essentially of the oligoarylene derivative. 
   
   
       10 . The organic electroluminescent device according to  claim 7 , wherein the luminescent layer further contains an arylamine compound. 
   
   
       11 . The organic electroluminescent device according to  claim 7 , wherein the luminescent layer further contains an styrylamine compound. 
   
   
       12 . The organic electroluminescent device according to  claim 7 , wherein the organic thin film layer has a hole transport layer containing the oligoarylene derivative as a single component or a component of a mixture. 
   
   
       13 . The organic electroluminescent device according to  claim 12 , wherein the hole transport layer consists essentially of the oligoarylene derivative. 
   
   
       14 . The organic electroluminescent device according to  claim 7 , wherein the organic electroluminescent device emits a blue light.