A perfluorinated aromatic compound is typically an electron acceptor and considered as an important n-type semiconductor for organic electronics.[1] We have reported the synthesis and electron-transport properties of perfluorinated phenylene oligomers. Branched oligomers [2] such as perfluoro-1, 3, 5-tris (p-terphenyl) benzene (C60F42) displayed the excellent ability to block exitons and holes in organic lightemitting diodes (OLEDs) with ...