The Temperature Dependence of the Luminescence Properties of Paramagnetic Vanadyl and Copper(II) Coproporphyrinates in Polystyrene Films

Vanadyl and copper(II) coproporphyrinates, as well as composite materials in polystyrene films based on them, are obtained that possess luminescence properties in the red spectral region. Analysis of the change in the luminescence spectra of the films under heating from 77 to 298 K is performed. It is found that the ratio of the intensities of the phosphorescence transitions changes with growing temperature in both porphyrin complexes, together with a strong change in phosphorescence lifetimes upon variation in temperature. Vanadyl and copper(II) coproporphyrinates in polystyrene films can be considered as luminescence temperature sensors on the basis of the change in the characteristics of luminescent glow.