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Advanced functional materials: long life organic room temperature phosphorescent nanocrystals in water

wallpapers News 2020-11-12
Spkds have a broad application prospect in the field of organic light sensing due to its diverse structure low toxicity. However the transition from singlet to triplet the transition from triplet to ground state (phosphorescence) is spin forbidden so it is difficult to observe the phosphorescence of organic compounds at room temperature. Recent studies have shown that molecular design can effectively promote spin orbit coupling inhibit non radiative deactivation. Room temperature phosphorescence of organic compounds can be observed in rigid media such as polymers crystals. However aqueous organic room temperature phosphorescence systems need to be developed.

Wu Lizhu academician team of Institute of physics chemistry of Chinese Academy of Sciences is committed to the development of aqueous organic room temperature phosphorescent materials. On the basis of previous work (J. am. Chem. SOC. 2019 141 5045; SCI. China chem. 2019 62 1194) our research team has recently prepared nanocrystalline assemblies based on donor acceptor molecules through micelle assisted assembly strategy realizing long-life organic room temperature phosphorescence stimulated by visible light in aqueous phase. It should be noted that the same molecule in the rigid bulk crystal can not be observed organic room temperature phosphorescence but mainly thermally induced delayed fluorescence. Through systematic spectral research crystal structure analysis theoretical calculation the team members revealed that the interaction between molecules heavy atom effect the stacking mode of molecules determine the long-life room temperature phosphorescence in aqueous nanocrystalline assemblies the thermally induced delayed fluorescence properties in solid crystals. This study shows that the ingenious assembly strategy is an effective way to realize the aqueous organic room temperature phosphorescence the difference of molecular stacking mode can cause the different luminescence behavior between nanocrystalline assembly bulk crystal which provides a new perspective platform for further exploring the intrinsic mechanism of pure organic room temperature phosphorescence new aqueous organic room temperature phosphorescent materials. Xiao Hongyan associate researcher of

Institute of physics chemistry provided strong support in theoretical calculation. The related work is supported by the Ministry of science technology National Natural Science Foundation of China the pilot program of Chinese Academy of Sciences.


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