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stability. [17] Many scholars have done indepth research [18,19] focused on extending application potential [20,21] of MQ 2 . At present, liquid-phase method [22,23] is the main method to synthesize MQ 2 . Most of liquidphase methods used organic solvents that pollute the environment and harm the human body, such as methanol, [24] acetone, [25] ether, [26] and acetic acid. [27] Another disadvantage of liquid-phase method is low yield. [28] The disadvantage is that MQ 2 can only be excited under ultraviolet light by liquid-phase method. [4][5][6][7][8][9][10][11] This spends a massive amount of energy and severely limits the scope of application of MQ 2 . Compared with ultraviolet light, visible light have the advantages of lower biotoxicity, easier operating, and easier obtaining. Therefore, to excite MQ 2 by visible light and to ensure that it keeps high luminous efficiency is the focus and difficulty of current research on this product. However, the existing synthesis methods have not been able to synthesize MQ 2 , which can photoluminescent by visible light. This study presents a new synthesize method to overcome this problem-that is, the mechanochemical activation method.The mechanochemical activation method is compared with the traditional liquid-phase method. First, there is no need to use organic solvents in the mechanochemical activation method and it is environmentally friendly. Second, because there is no chemical equilibrium, the yield of the mechanochemical activation method is much higher than that of the traditional liquidphase method. Third, smaller size BaQ 2 can be synthesized by mechanization activation method. The mechanochemical activation method is compared with the traditional solid-phase method. First, the mechanochemical activation method makes the reactants contact in the molecular level and it increases the contact area between the reactants. Second the mechanochemical activation method reduces the heat energy of the solid-phase reaction, so that it can react under the condition of low heat.This study demonstrates that the mechanochemical activation method can synthesize the BaQ 2 that has a yield of 99.6% and can photoluminescent under 408 nm visible light. Findings from this study provide a new perspective on synthesis of the visible-light-excited luminescent material MQ 2 and enhance the prospects in the field of luminescent materials. Using high-energy UV-light to excite 8-hydroxyquinoline barium (BaQ 2 )is a short slab for this emerging area of organic luminescent materials. However, using visible light to excite BaQ 2 has not been reported. To solve this problem, this study proposes the mechanochemical activation method to synthesize luminescent material of visible-light-excited BaQ 2 . 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 2 has a high crystallinity, sma...

In article number https://doi.org/10.1002/gch2.201900052, Xueming Zhong and co‐workers propose a mechanochemical activation method to synthesize 8‐hydroxyquinoline barium, which is of interest as a luminescent material for energy applications. The synthesized material can photoluminesce under 408 nm visible light and has a higher crystallinity and smaller particle size than that synthesized by the traditional liquid‐phase method.