Organic electroluminescent display device and chemical compounds for liquid crystals

Abstract

The new organic electroluminescent display device has a carrier-transporting layer and/or an organic luminous layer composed of a nematic liquid crystal or a liquid crystal dispersing a carrier-transporting low-molecule therein. When the organic luminous layer is to be bestowed with faculty as a liquid crystal, it is made of a nematic liquid crystal. Both the carrier-transporting layer and the organic luminous layer may be bestowed with faculty as a liquid crystal. Since the liquid crystal is incorporated in the carrier-transporting layer and/or the organic luminous layer, the display device can be driven as a liquid crystal display device in a dark place by charging with a voltage lower than a light emission initiating potential. Of course, it is driven as an electroluminescent display device when it is charged with a voltage higher than the light emission initiating potential. Use of an electroluminescent liquid crystal as a organic luminous layer enables omission of a carrier-transporting layer.

1 . An organic electroluminescent liquid crystal comprising a chemical compound having a general constitutional formula of:  
     
       
         
         
             
             
         
       
       wherein R 1  is a straight-chained alkyl group containing 1-20 carbon atoms, R 2  to R 9  is individually hydrogen or an alkyl group containing 1-3 carbon atoms, and Ar 1  is a substituted or non-substituted aryl group containing 6-14 carbon atoms.  
     
   
   
       2 . An electroluminescent liquid crystal comprising a chemical compound having a general constitutional formula of:  
     
       
         
         
             
             
         
       
       wherein R 10  and R 11  are individually straight-chained alkyl groups containing 1-20 carbon atoms, and Ar 2  and Ar 3  are individually substituted or non-substituted aryl groups containing 6-14 carbon atoms.  
     
   
   
       3 . An electroluminescent liquid crystal comprising a chemical compound having a general constitutional formula of:  
     
       
         
         
             
             
         
       
       wherein R 12  is a straight-chained alkyl group containing 1-20 carbon atoms, and R 13  to R 17  are individually hydrogen or alkyl groups containing 1-3 carbon atoms.  
     
   
   
       4 . An electroluminescent liquid crystal comprising a chemical compound having a general constitutional formula of: 
       R 18 —Ar 4 —Ar 5 —O—R 19 , wherein R 18  and R 19  are individually straight-chained alkyl groups containing 1-20 carbon atoms, and Ar 4  and Ar 5  are individually substituted or non-substituted aryl groups containing 6-14 carbon atoms.    
   
   
       5 . An electroluminescent liquid crystal comprising a chemical compound having a general constitutional formula of:  
     
       
         
         
             
             
         
       
       wherein R 20  is a straight-chained alkyl group containing 1-20 carbon atoms, and Ar 6  to Ar 10  are individually substituted or non-substituted aryl groups containing 6-14 carbon atoms.