Internship opportunity at LGP2 - Feb-July 2026 - Optically active materials and devices are used in numerous applications related to energy, the environment and health, with many examples in the fields of semiconductors, photovoltaics, catalysts, sensors, etc. Many optical and/or electronic applications still require non-toxic processing media (non-volatile solvents) and low-temperature, additive-free deposition techniques, such as coating/printing, in order to meet the needs of continuous large-scale production on flexible substrates. Many developments have already been made, leading to the emergence of functional fluids (inks) for producing thin, multi-layer active systems (solar cells, OLEDs, sensors, screens, antennas, etc.). The EC-LIPSE project proposes to address the eco-design and development of innovative and sustainable methods for the manufacture of efficient optically active systems, focusing initially on electrochromic devices (ECDs).