AIE macro-molecule crystallinity fluorescence visualization method
A crystallinity and polymer technology, which is applied in the application field of aggregation-induced luminescent molecules in the fluorescence visualization of polymer crystallinity, which can solve the problems of uncertainty, inhomogeneity, and hindering the precise control of polymorphism in large-area molecular systems.
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[0012] In this application, a highly twisted AIE luminescent agent TPE-EP with a D–A structure is used. TPE-EP consists of three groups: hydrophobic TPE as electron donor unit, hydrophilic pyridinium salt group as electron acceptor unit, double bond as spacer unit ( figure 1 a). We preliminarily studied the polymorphic forms of TPE-EP prepared in bulk solution to understand the relationship between its photophysical behavior and structural arrangement. By controlling the precipitation conditions, three crystal forms (G, Y and O) can be obtained. figure 1 b shows photographs of G-crystals, Y-crystals and O-crystals taken under a fluorescence microscope. The green photoluminescence of G-crystals was observed under ultraviolet excitation (405nm), the maximum luminous wavelength was 507nm, and the quantum yield (Φ F ) is 0.21 and the lifetime is 2.1ns ( figure 1 c, green solid line). The crystal structure of G was analyzed by single crystal X-ray diffraction (XRD). G-crystal...
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