Novel branched alpha-cyanostilbene fluorophores

Abstract

A branched α-cyanostilbene fluorescent materials with a new structure useful to the organic electroluminescence display (OELD), which includes the organic substance in the state of powder, liquid and film with the stilbene core structure and the terminal branched phenyl structure. The fluorescent materials of the invention exhibits the high luminescent efficiency and is capable of tuning the fluorescent colors of red, green and blue according to the core structure in the molecular, i.e., the structure of stilbene radical, particularly it exhibits the higher luminescent efficiency in the state of solid more than solution.

1 . α-cyanostilbene compounds of the formula 1: 
     
       
         
         
             
             
         
       
     
     R 2  and R 3  denotes respectively substituted or unsubstituted heterocycle, and the substituted or unsubstituted heterocycle can be condensed at the optional site of the corresponding two benzene rings. 
   
   
       2 . An organic electro-luminescent composition comprising α-cyanostilbene compounds of the formula 1: 
     
       
         
         
             
             
         
       
       R 2  and R 3  denotes respectively, substituted or unsubstituted heterocycle, and the substituted or unsubstituted heterocycle can be condensed at the optional site of the corresponding two benzene rings. 
     
   
   
       3 . An material in the state of powder, organic solution and film comprising α-cyanostilbene compounds of the formula 1: 
     
       
         
         
             
             
         
       
     
     R 2  and R 3  denotes respectively substituted or unsubstituted heterocycle, and the substituted or unsubstituted heterocycle can be condensed at the optional site of the corresponding two benzene rings.