Enhancing Solid‐State Emission from Conjugated Polymers via Self‐Forming Host–Guest Systems

A novel host–guest system leading to enhanced luminescence (see Figure) is investigated using a self‐forming, solid‐state solution of a conjugated polymer. Poly(fluorene‐alt‐thiophene)s are synthesized with varying ratios of 2,5‐ and 3,4‐thiophene linkages. Small quantities of 2,5‐linkages give rise to systems in which a matrix of 3,4‐thiophene‐linked conjugated polymer transfers electronic excitation energy to isolated, emitting 2,5‐thiophene‐linked conjugated segments.