Multicolour emissive nonconventional macromolecular luminogens with aggregation-induced emission have drawn great attention due to their potential application in a wide range of areas. However, the exploration of efficient synthetic strategies and emission mechanisms still remains a challenge. Herein, we report a facile route to the synthesis of hyperbranched polysiloxane (P1) with adjacent –CO and –CC 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; based on its remarkable luminescence properties, we proposed a new luminescence mechanism namely “multiring-induced multicolour emission” (MIE). In addition, the stimuli-responsive behaviour of P1 as well as its application in data encryption based on the quenching effect of Fe³⁺ was studied. This work provides guidance to design and synthesise nonconventional macromolecular AIEgens with multicolour luminescence.

中文翻译：

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多环引起的多色发射：带有硅桥的超支化聚硅氧烷，用于数据加密

具有聚集诱导发射的多色发射非常规大分子发光剂由于其在广泛领域中的潜在应用而备受关注。然而，探索有效的合成策略和排放机制仍然是一个挑战。在本文中，我们报告了一种易于合成的带有-C O和-C C相邻基团的超支化聚硅氧烷（P1）的方法。令人惊讶的是，它不仅在白光激发下显示出蓝色发射，而且在不同激发波长下也显示出多色发光。尤其是，可以在第一代P1分子之间通过以下方式找到多个贯穿空间的共轭环DFT计算；基于其卓越的发光特性，我们提出了一种新的发光机制，即“多环诱导的多色发射”（MIE）。此外，还研究了基于Fe ³⁺的猝灭作用的P1的刺激响应行为及其在数据加密中的应用。这项工作为设计和合成具有多色发光的非常规大分子AIEgen提供了指导。