The influence of sol–gel processing parameters on the photochromic spectral and dynamic behaviour of a naphthopyran dye in an ormosil coating
Abstract
A photochromic naphthopyran derivative was embedded in a Ph-modified ormosil coating. Important changes in the photochromic properties of the films were induced by modifications in the preparation parameters of the sol–gel processing, such as the hydrolysis and condensation of the sols, the photochromic-dye loading in the film and the curing of the samples after deposition. In this way, it is possible to control the thickness of the resulting coatings, their