Abstract Dihydroxyoligophenylenes ( HO-ArPh( m)-OH s) with 9,9-dihexyl-2,7-fluorene (Ar=Flu), 2,5-dioctyloxy-1,4-benzene (Ar=Dob), pyridine (Ar=Py), or thiophene (Ar=Th) rings were synthesized by the Suzuki coupling reaction. Absorption maxima ( λ max) of HO-ArPh( m)-OH s shifted progressively toward long wavelengths due to the expansion of the π-conjugation system with an increase in the number of benzene rings. Deprotonation of the OH groups of HO-ArPh( m)-OH s by treatment with NaH caused a bathochromic shift of λ max. The bathochromic shift of the deprotonated species increased with the donor numbers (DNs) of the solvents. The emission peak positions of NaO-ArPh( m)-ONa s depended on the DNs of the solvents; therefore, the emission color could be tuned by changing the solvent.