Depth Profile of Pyrene Dopant in Polymer Films by Variable-Angle Total Internal Reflection Fluorescence Spectroscopy

Abstract

The incident and observation angular dependences of the fluorescence from pyrene-doped polymer films are measured by variable-angle total internal reflection fluorescence spectroscopy. These angular profiles depend on refractive index, film thickness, observation wavelength, pyrene concentration, absorption coefficient of the polymer film, and so on. The profiles are in good agreement with the results calculated by fitting the parameters and by considering interference effects and concentration profiles. Step profiles of the pyrene concentration explain the results for the segmented poly(urethaneurea) film, while, in poly(methyl methacrylate) and polystyrene films, pyrene is distributed homogeneously.