Donor-acceptor type silole compounds with aggregation-induced deep-red emission enhancement: synthesis and application for significant intensification of near-infrared photoluminescence.

Through efficient Förster resonance energy transfer, the near-infrared emission (850 nm) of a guest (weak near-infrared emitter)-host (strong deep-red emitter) system is greatly enhanced by excitation of the host molecule at 508 nm, in comparison with excitation of the guest molecule at 660 nm.