The electronic absorption and fluorescence spectra of electrosynthesized po
ly(3-methoxythiophene)-bithiophene (PMOT-BT) composite oligomers were studi
ed in organic solution (DMSO) and/or in the solid state on ITO plates. Diff
erent spectral properties (absorption and fluorescence maximum wavelengths,
fluorescence quantum yields, etc.) were found to depend on the bithiophene
initial concentration used during electrosynthesis and, subsequently, on t
he film composition and oligomer chain length.