Axel Pausch

New fluorinated heterocyclic compounds for improved FLC mixtures

New suitable homologues of SmC host materials including different classes of fluorinated and non-fluorinated alkyl-alkyloxy-phenylpyrimidines were developed. Some materials were chosen to develop a new SmC host mixture. Several new chiral dopants have been synthesized. We found an influence of the different ring-systems and various side chains on the physical properties. Chiral dopants with more than one chiral center exhibit interesting properties. One dopant with a fluorine atom at the chiral center and a biphenyl-cyclohexane core showed the best properties and was chosen to introduce, together with the new SmC host mixture, new FLC-mixtures with improved properties. By using low-volt multiplex driving schemes and also high-volt multiplex driving schemes it is shown that these mixtures with an adjustable Ps fulfill the requirements for both methods.