Incorporation of o-carborane into the backbone of poly-(dihexylfluorene)s drastically affects emission properties due to an intramolecular charge-transfer state (ICT) that forms between the fluorene and carborane moieties in the polymer backbone, which is emissive and solvatochromic. Such polymers exhibit duel emissions from both the ICT state and the conjugated fluorene local excited state (LES). In order to evaluate the influence of higher degrees of LES conjugation on the emission properties of carborane-containing poly(dihexylfluorene)s, four random copolymers were synthesized with different feed ratios of 2,7-dibromo-9,9-dihexyl-fluorene and 1,2-bis(7-bromo-9,9-dihexyl-9H-fluoren-2-yl)-closo-dicarbodecaborane. These polymerizations were carried out through Yamamoto coupling with greater equivalents of 2,7-dibromo-9,9-dihexylfluorene, and the photophysical properties were compared to the homopolymer of 1,2-bis(7-bromo-9,9-dihexyl-9H-fluoren-2yl)-closo-dicarbodecaborane. With increasing equivalents of 2,7-dibromo-9,9-dihexylfluorene the polymer molecular weight is increased from the homopolymer, the ground-state absorption is red shifted, and the emission spectra show gradually increasing LES character. Time-resolved spectroscopic methods displayed the characteristic ICT excited-state absorption and decay for three of the polymers, with the LES absorption and decay features increasing in intensity with increasing fluorene character in the polymer backbone. The polymer with the largest degree of conjugated fluorene shows excited-state properties consistent with a linear poly(dihexylfluorene), showing negligible ICT character. In the solid state, the intensity of the ICT emission is enhanced as compared to the LES emission for the copolymers with the largest degree of conjugated fluorene. Through synthetic tuning, it is possible to produce polymers with higher molecular weights, and overall characteristics of the non-carborane-containing analogues, but maintain the useful properties of carborane-containing materials, like solvatochromism, in the solid state.