R. Fink et al., AROMATIC POLYETHERS WITH 1,3,5-TRIAZINE UNITS AS HOLE BLOCKING ELECTRON-TRANSPORT MATERIALS IN LEDS, Macromolecular symposia, 125, 1998, pp. 151-155
Various difluoro functionalized aromatic 1,3,5-triazine monomers were
prepared. A series of poly-(1,3,5-triazine-ether)s was synthesized by
polycondensation with 4,4'-(hexafluoroisopropylidene)diphenol. The pol
ymers have excellent thermal stability and are amorphous with glass tr
ansition temperatures in the range of 190-250 degrees C. In order to e
xamine the potential to apply these polymers in organic electrolumines
cent devices, the redox properties were studied by cyclic voltammetry.
It was found that the monomers have high electron affinity and reach
LUMO values in the range of -2.7 to -3.1 eV. This opens the possibilit
y to utilize 1,3,5-triazine containing materials as electron injecting
/hole blocking layer in LEDs. First LED results are in accordance to t
hese high electron affinities.