Synthesis and Electrooptical Properties of Copolymers Derived from Phenol-Functionalized Telechelic Oligofluorenes

This paper describes the synthesis, characterization, and electrooptical properties of a series of phenol-capped, discrete oligofluorenes with 2, 3, 5, and 7 fluorene units and a statistical oligomer with an average of about 10 fluorene units. Polymers were prepared from the oligomers by various linking reactions through the phenol groups. High molecular weight polycarbonate polymers derived from these oligomers were prepared using BPA−bis-chloroformate (BPABCF) as the linking group. Trends in the optical and electrical properties as a function of oligomer length are reported. Device data for this family of emissive copolymers indicates that charge mobility increases with conjugation length and can be better than that of an analogue homopolymer. A surprising shift in LUMO values due to CF3 substitution at the ends of the oligomers was observed.