Manipulation of dual fluorescence behavior in aggregation-induced emission enhancement of a tetraphenylethene-appended polymer by optical tweezers
Manipulation of dual fluorescence behavior in aggregation-induced emission enhancement of a tetraphenylethene-appended polymer by optical tweezers
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DOI：
10.1039/d1tc01631h
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发表时间：
2021-05
影响因子：
6.4
通讯作者：
Shun‐Fa Wang;Bo-Wei Chen;Ayami Itagaki;Fumitaka Ishiwari;T. Fukushima;H. Masuhara;T. Sugiyama
中科院分区：
文献类型：
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作者：
Shun‐Fa Wang;Bo-Wei Chen;Ayami Itagaki;Fumitaka Ishiwari;T. Fukushima;H. Masuhara;T. Sugiyama
研究了光镊对四苯乙烯（TPE）聚合物聚集诱导发光增强（AIEE）中双荧光行为的调控。使用聚焦近红外连续波激光的光镊导致在激光焦点处产生由聚合物组成的单个微米大小的聚集体。几分钟后，激活AIEE，在530 nm处观察到绿色荧光发射。连续照射到聚集体中导致聚集体周围形成高浓度的聚合物溶液，其荧光从绿色变为蓝色。蓝色溶液在457和530 nm处显示出两种荧光发射，其强度取决于与激光焦点的距离。通过调节激光功率可以任意调节两种荧光的比例，表明光镊可以实现对荧光位置的任意控制。光镊控制荧光团周围的局部环境，并提供各种聚合物缔合，导致双重荧光发射。通过光镊研究了双AIEE荧光的动力学和机制，研究了聚合物缔合和荧光团构象随激光功率的变化。
The manipulation of dual fluorescence behavior in aggregation-induced emission enhancement (AIEE) of a tetraphenylethene (TPE)-appended polymer by optical tweezers was investigated herein. Optical tweezers using a focused near-infrared continuous-wave laser resulted in the generation of a single micrometer-sized aggregate consisting of polymers at the laser focus. After a few minutes, AIEE was activated, and green fluorescence emission was observed at 530 nm. Continuous irradiation into the aggregate led to the formation of a highly concentrated solution of polymers around the aggregate, the fluorescence of which changed from green to blue. The blue solution exhibited two fluorescence emissions at 457 and 530 nm, and their intensity depended on the distance from the laser focus. The two fluorescence ratios could be arbitrarily regulated by tuning the laser power, indicating that optical tweezers could enable arbitrary control of the fluorescence position. Optical tweezers controlled the local environment around the fluorophore and provided various polymer associations, resulting in dual fluorescence emissions. The dynamics and mechanism of dual AIEE fluorescence by optical tweezers were examined in terms of polymer association and change in the fluorophore conformation depending on the laser power.