Luminescent polymers and blends with hydrogen bond interactions

Organic luminogens with aggregation-induced emission (AIE) properties have unusual emission behaviour in that their non- or weakly-emissive solutions can be tuned to emit strongly in the solution aggregated and solid states. As restricted molecular rotation of luminogens is the main mechanism leading to AIE activity, hydrogen bond (H bond) interactions are therefore used in organic and polymeric luminogens to impose efficient rotational restriction and to intensify the emission intensity of the AIE-active luminogens. Luminogenic polymers containing H-bonding groups and luminogenic blends consisting of H-bond donors and acceptors are therefore described in this review to evaluate the relationship between H bond interactions, rotational restriction and AIE-related emission intensity.