SYNTHESIS AND CHARACTERIZATION OF AROMATIC POLY( 1,3,5-TRIAZINE-ETHER)S FOR ELECTROLUMINESCENT DEVICES

Various difluoro functionalized aromatic 1,3,5-triazine monomers were prepared. A series of poly(1,3,5-triazine-ether)s was synthesized by p olycondensation with 4,4'-hexafluoroisopropylidenebis[phenol]. The pol ymers have excellent thermal stability and are amorphous with glass tr ansition temperatures in the range 190-250 degrees C. In order to exam ine the potential application these polymers may possess for use in or ganic electroluminescent devices, the redox properties were studied by cyclic voltammetry. It was found that the monomers have high electron affinities and reach LUMO values in the range of -2.7 to -3.1 eV. Thi s opens the possibility to utilize 1,3,5-triazine-containing materials as electron injecting/hole blocking layer in LEDs. Initial LED result s are in accordance with these high electron affinities.