Multiring-Induced Multicolour Emission: Hyperbranched Polysiloxane with Silicon Bridge for Data Encryption
Multicolour emissive nonconventional macromolecular luminogens with aggregation-induced emission have drawn great attention due to their potential applications in a wide range of areas. However, the exploring of efficient synthetic strategies and emission mechanisms still remain challenging. Herein, we report a facile route to synthesis hyperbranched polysiloxane (P1) with adjacent -C=O and -C=C groups. Surprisingly, it not only showed blue emission under white light excitation, but also exhibited multicolour luminescence under different excitation wavelengths. Especially, multiple through-space conjugation rings can be found between the first generation P1 molecules via DFT calculation, combined with its remarkable luminescent properties, we proposed a new luminescence mechanism namely “multiring-induced multicolour emission” (MIE). In addition, the stimuli-response behaviour of P1 as well as its application in data encryption based on the quenching effect to Fe3+ were studied. This work provides a guidance to design and synthesis nonconventional macromolecular AIEgens with multicolour luminescence.