Compositions containing at least one sort of semiconducting nanoparticle, at least one antioxidant, a polymerizable component, a liquid organic compound and an organic additive of formula (II)




wherein M is a divalent metal ion; and R1 and R2 are, each independently, a straight chain alkyl group having 1 to 16 carbons atoms, or a straight chain alkenyl group having 2 to 15 carbon atoms or branched chain alkyl or alkenyl group having 3 to 15 carbon atoms, and polymer or composite layers formed therefrom, optical devices containing the layers and their preparation and method of use, as well as a method to improve at least one feature of a quantum material or a quantum material layer.