呼吸响应彩色室温磷光材料和组装诱导磷光增强策略,Small

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呼吸响应彩色室温磷光材料和组装诱导磷光增强策略
Small ( IF 13.0 ) Pub Date : 2023-02-12 , DOI: 10.1002/smll.202207403
Wenyan Ye ₁ , Yandong Wang ₁ , Tengyang Cao ₁ , He Meng ₁ , Chunlei Wang ₁ , Bingxuan Hu ₁ , Zeyu Gao ₁ , Caiqi Wang ₁

Affiliation

从纯有机聚合物中获得色彩鲜艳、余辉长的室温磷光（RTP）材料仍然是非常具有挑战性的。在此，发现天然高分子壳聚糖（CS）不仅具有自身的RTP，还能与不同的磷光分子发生反应，得到多色、长余辉的RTP材料。CS 可以发出具有 48 毫秒生命周期的 RTP。此外，CS富含氨基，通过酰胺化反应将不同的磷光分子接枝到CS上，可以调控其发出不同颜色的磷光，得到一系列色彩鲜艳的CS衍生物。由于良好的成膜能力，所获得的聚合物薄膜还具有超长的RTP。此外，与 α-环糊精一起选择的一种 CS 衍生物用于构建寿命长达数秒的 RTP 材料。主客体相互作用用于抑制非辐射弛豫并建立结晶域，从而协同增强 RTP。有趣的是，CS 衍生薄膜的 RTP 特性对水和热刺激极为敏感，因为水破坏了相邻 CS 分子之间的氢键，从而改变了材料中的刚性环境。最后，它们可以用作刺激响应墨水和监测环境湿度。

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Respiration-Responsive Colorful Room-Temperature Phosphorescent Materials and Assembly-Induced Phosphorescence Enhancement Strategies

It is still very challenging to obtain colorful and long-afterglow room-temperature phosphorescent (RTP) materials from pure organic polymers. Herein, it is found that chitosan (CS), a natural polymer, not only has its own RTP, but also reacts with different phosphorescent molecules to obtain a multicolor, long-afterglow RTP material. CS can emit RTP with a lifetime of 48 ms. In addition, CS is rich in amino groups, and grafting different phosphorescent molecules onto CS by an amidation reaction can modulate it to emit different colors of phosphorescence and obtain a series of colorful CS derivatives. The obtained polymer films also have ultra-long RTP due to the good film-forming ability. In addition, one of the CS derivatives selected with α-cyclodextrin is used to construct RTP materials with lifetimes of up to seconds. The host–guest interactions are used to suppress nonradiative relaxation and build crystalline domains, thus synergistically enhancing the RTP. Interestingly, the RTP properties of the CS derivative films are extremely sensitive to water and heat stimuli, because water broke the hydrogen bonds between adjacent CS molecules and thus altered the rigid environment in the material. Finally, they can be used as a stimuli-responsive ink and for monitoring environmental humidity.

更新日期：2023-02-12

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