Determination of the linear optical constants of poly(9,9-dioctylfluorene)

The dispersion of the refractive index of poly(9,9-dioctylfluorene) has been determined in the spectral region immediately below its absorption edge. Both the Cauchy and Sellmeier models for the functional form of the refractive index dispersion were used to analyse transmittance interference fringes. The refractive index increases from 1.614 at 900 nm to 1.781 at 450 nm.