Abstract
AbstractPhotocontrolled light‐harvesting supramolecular assembly with aggregation‐induced excimer emission is fabricated by polyanionic γ‐cyclodextrin (COONa‐γ‐CD), pyrene derivative (PYC12), Nile red (NiR), and diarylethene derivative (DAE) in aqueous solution. Benefiting from the COONa‐γ‐CD‐induced aggregation of PYC12, the fluorescence can be modulated from monomeric state to assembled state with a large red‐shift around 100 nm, which exhibits aggregation‐induced excimer emission enhancement and makes PYC12 a remarkable energy donor. Subsequently, NiR can function as energy acceptor loaded into PYC12/COONa‐γ‐CD supramolecular assembly, and highly efficient energy transfer process occurs from PYC12/COONa‐γ‐CD to NiR, with energy transfer efficiency up to 83% at donor/acceptor ratio of 160:1. Moreover, multicolor tunable emission can be achieved simply by tuning the molar ratios of donor and acceptor, notably including white‐light emission. Interestingly, loading photoresponsive energy acceptor DAE into PYC12/COONa‐γ‐CD/NiR assembly endows the light‐harvesting system with excellent photocontrolled energy transfer, and this process can be efficiently regulated upon distinct light irradiation.
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