Effect of polysiloxane encapsulation material compositions on emission behaviour and stabilities of perylene dyes

Abstract

-aryl substituents at the dye structure decrease the probability of dye-dye interaction and increase the absolute quantum yields additionally. Increased photostability and no leaching was observed when the dye was covalently attached to the polymer matrix. Additionally covalent bonding to and improved solubility of the organic dyes in the polysiloxanes allow for a solvent free processing of such dye-matrix combinations. In conclusion a good matching between the matrix and the dye is crucial for a substitution of inorganic conversion dyes by organic ones in LED devices.