Dresden 2020 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 39: Charged Soft Matter, Polyelectrolytes and Ionic Liquids
CPP 39.10: Talk
Tuesday, March 17, 2020, 12:00–12:15, ZEU 114
Environmental controlled Molecular Plasmon Resonance of Anthracene — •Woldemar Niedenthal1,2, Dennis Pietruschka2,3, Doreen Mollenhauer2,3, and Sangam Chatterjee1,2 — 1Institute of Experimental Physics I, Justus-Liebig-University, Giessen, Germany. — 2Center for Materials Research, Justus-Liebig-University, Giessen, Germany. — 3Physikalisch-Chemisches Institut, Justus-Liebig-Universität, Gießen, Germany.
Within the last years polycyclic hydrocarbons (PHCs) were investigated as materials for electrochromic applications. It was proposed that the underlying processes of the color change are based on purely electronic excitation processes, i.e. photon absorption and the formation of molecular plasmons. This mechanisms predict an ultrafast switching speed between the charged and the neutral state. We studied the absorption behavior of charged and neutral anthracene by changing the liquid electrolyte and in devices with polymer-gel-electrolytes by cyclo-voltametric measurements. The experiments show a clear dependence of the color changing process on the electrolyte and polymer surrounding. The results show that the color changing processes of the electrochromic devices are more complex than considered so far. Further investigations are needed to uncover the full effect of the surrounding medium on the colorization processes.