Shun-Fa Wang Jhao-Rong Lin Fumitaka Ishiwari Takanori Fukushima Hiroshi Masuhara Teruki Sugiyama
We present spatiotemporal control of aggregation‐induced emission enhancement (AIEE) of a protonated tetraphenylethene derivative by optical manipulation. A single sub‐micrometer‐sized aggregate is initially confined by laser irradiation when its fluorescence is hardly detectable. The continuous irradiation into the formed aggregate leads to sudden and rapid growth, resulting in bright yellow fluorescence emission. The fluorescence intensity at peak wavelength at 540 nm is tremendously enhanced with the growth, meaning that AIEE is activated by optical manipulation. Amazingly, the switching on/off of the activation of AIEE is controlled arbitrarily by alternating laser power. This means that optical manipulation increases local concentration, which overcomes the electrostatic repulsion between the protonated molecules, namely, optical manipulation changes the aggregate structure. The dynamics and mechanism in AIEE controlled by optical manipulation will be discussed from the viewpoint of molecular conformation and association depending on laser power.
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