Comparative study of the optical behavior of a porphyrin encapsulated in sol-gel silica coatings and in solution as a function of pH

Abstract

Porphyrin-doped silica coatings were prepared by sol-gel. Films optical properties were studied and compared to the behavior of the molecule in solution. A quasi-linear behavior throughout the pH range studied was found. Luminescent emission peak and molar absorptivity were maximum at slightly lower wavelength than molecule in solution.