Transient absorption spectroscopy: a fundamental tool for progress in medical therapies, renewable energies and electronic devices.

In this work, we used transient absorption spectroscopy to study three different light sensitive systems: Triplet Photosensitizers, Luminescent Solar Concentrators and Molecular Photoswitches. In all these systems, unwanted transient states can drastically reduce the rate of the following exploitable photophysical transformation. Our attention was devoted to understand the reaction mechanisms of the photoinduced processes, in order to gather information about the possible ways to improve their yield.