CBM researchers make the cover page of a volume of the journal "Chemistry-A European Journal" during a work dedicated to the creation and rationalization of the behavior of Erbium complexes, formed with a new generation of ligands, to generate the luminescence of Er which is rarely observed in the visible range for a molecular compound. The results of this work, carried out in close collaboration with researchers from the Chemistry Section of the University of Geneva in Switzerland, open up major new perspectives in the field of higher molecular energy converters.