| abstract |
OLED compounds of the general structure: B-S— A— S— B in which rod-like nuclei A comprise a condensed aromatic ring structure in turn comprising fluorene ring structures condensed with at least one additional fluorene ring structures wherein the fluorene ring systems comprised by the condensed aromatic structure are substituted at the 9-position, and in which the 9-positions of the fluorenes are not susceptible to oxidation. |