Exciton Migration and Trapping in Copolymers Based on Dialkylfluorenes

Abstract

Poly(fluorenes) have potential use in light-emitting diodes; however, their application has been hampered by their tendency to form excimers and aggregates. In this paper, the copolymerization of 2,7-dibromo-9,9-dialkylfluorenes with low-bandgap chromophores, such as 3,9(3,10)-dibromoperylene and 4,4′-dibromo-α-cyanostilbene, is described. These readily soluble and processable polymers display longer wavelength emissions than polyfluorene homopolymers in thin films, which indicates rapid exciton migration and trapping in these systems.