Optical study of dye-containing fluorinated polyimide thin films

Thin films of dye-containing fluorinated polyimide have been obtained by ad ding the dye powder to the polyamic acid resin and by spin coating the resu lting solution on silica and silicon substrates. 6FDA (4, 4 ' -hexafluorois opropylidene diphthalic anhydride) and DAB (diaminobenzophenone) have been used as precursor monomers and rhodamine B as dye. The influence of the rho damine-B molecule on the completeness of the imidization process has been s tudied by coupled thermogravimetric and mass-spectrometric analyses (TG-MS) of pure and doped polyamic acid resin and by FT-LR analysis of samples bef ore and after curing. Optical emission, excitation and absorption spectra h ave been collected in order to study spectroscopic and aggregation characte ristics of rhodamine as a function of the deposition parameters.