Temperature characteristics of optical parameters of phthalocyanine LB films and spin-coated films

摘要

The LB films and spin-coated films of tetra-neopentoxy phthalocyanine zinc (TNPPcZn) were prepared and annealed at different temperatures. Their refractive index (n) and extinction coefficient (k) were measured by p-polarized reflectance. The similar value of n and k, as well as similar changing tendency of n and k at varied annealing temperatures, was found between LB films and spin-coated films. In addition, the absorption curves of TNPPcZn LB films and spin-coated films in visible range at different annealing temperature were investigated. The results indicate that the changing tendency of the extinction coefficient of two kinds of TNPPcZr films obtained from two methods mentioned above were coincident. When the annealing temperature increased to 150℃, the monomers of TNPPcZn films transformed to aggregates, n_f and k_f of the films increased. Further, n_fand k_f decreased as aggregates changed back to monomers again at the annealing temperature of 300℃. The experimental results coincide well with the theoretical analysis.