Green Synthesis of 8-Hydroxyquinoline Barium as Visible-Light-Excited Luminescent Material Using Mechanochemical Activation Method.

Using high-energy UV-light to excite 8-hydroxyquinoline barium (BaQ) is a short slab for this emerging area of organic luminescent materials. However, using visible light to excite BaQ has not been reported. To solve this problem, this study proposes the mechanochemical activation method to synthesize luminescent material of visible-light-excited BaQ. This research applies infrared spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, and fluorescence spectrometry to analyze the structure and luminescence properties. XRD shows that BaQ has a high crystallinity, small crystalline size, and high purity. According to the Scherrer equation, the mean particle size is 56 nm. The results of fluorescence spectrometry show that the excitation spectrum of the product is red-shifted, and the maximum excitation wavelength is 408 nm. According to these results, the product has a high fluorescence and can be excited under visible light. This research explains the high efficiency of the mechanochemical-activation method by thermodynamic and dynamic principles. This research also exemplifies luminescence theory of BaQ and at the microlevel explains the theory of visible-light-excited theory and the principle of luminescent intensity enhancement from the point of crystallography.