JACS: the research team of academician Tian He of East China University of science and technology and Professor Ma Xiang has made a breakthrough in the field of pure organic room temperature phosphorescent materials

Pure organic room temperature phosphorescent materials have the advantages of long life, low toxicity and easy processing, which are expected to be widely used in photoelectric and biochemical materials The research team of Tian He, academician of East China University of science and technology and Professor Ma Hui has made a breakthrough in this research field Recently, the Journal of American Chemical Society published "amorphous metal free room temperature photographic small molecules with multicolor photoluminescence via a host guest and dual emission" The research work of the team in the field of pure organic room temperature phosphorescent materials was reported online under the title of strategy Most of the traditional room temperature phosphorescent materials are inorganic or organometallic complexes containing precious metal elements, which are expensive and toxic, so it is urgent to develop and prepare pure organic room temperature phosphorescent materials to replace them In view of the fact that the excited trilinear energy of organic molecules is easily inactivated by thermodynamic vibration and collision or exposure to quenching factors such as oxygen, it is difficult for pure organic materials to produce efficient room temperature phosphorescence emission At present, most of the construction of organic room temperature phosphorescence system is based on highly ordered lattice or rigid matrix embedded materials The preparation process is inconvenient and not easy to repeat, which limits the development of such materials In this work, the team modified the heavy atom phosphorescent dye group to β - cyclodextrin, and prepared a series of amorphous organic small molecular compounds with high efficient room temperature phosphorescent emission The hydrogen bond environment between these amorphous solid-state cyclodextrin derivatives can not only fix the phosphor group to inhibit its non radiation relaxation, but also isolate the phosphor group from the external quenching substances, so as to ensure the efficient room temperature phosphorescence emission of molecules At the same time, because cyclodextrin has a large hydrophobic cavity which can selectively encapsulate aromatic compounds, they also choose to use one of the main derivatives of cyclodextrin and fluorescent guest molecules to pre assemble in water by the host guest interaction to build a supramolecular system, and prepare the inclusion complex with phosphorescence fluorescence CO emission and polychromatic luminescence (including white light emission) adjustable properties Material This research achievement is the first report on the amorphous room temperature phosphorescent materials of pure organic small molecules The preparation method is novel, simple and universal It has been highly praised by journal editors and reviewers (top 5%), and selected as journal cover report Source: J am Chem SOC 2018, DOI: 10.1021/jacs.7b12800 the co first author of the paper is Li Dengfeng, pH In recent years, Professor Ma Xiang, winner of the National Excellent Youth Fund, has made a series of important progress in the field of controllable polychromatic luminescence (including fluorescence and room temperature phosphorescence) materials based on organic functional dyes: a molecular machine with controllable polychromatic fluorescence emission and multiple stimulus response has been designed and synthesized (j.am.chem.soc 2016, 138, 13541); reported the [2] rotaxane molecular machine (chem SCI 2016, 7, 4582) driven by acid and alkali and having room temperature phosphorescence emission function, constructed the pure organic polymer material with high efficiency room temperature phosphorescence emission (adv opt Mater 2016, 4, 139; ind Eng chem Res., 2017, 56, 3123), etc The research results are jointly supported by the NSFC basic science center project led by academician Tian He, as well as the NSFC innovation research group project and the excellent youth fund project Paper link: pubs.acs.org/doi/10.1021/jacs.7b12800 personal profile of academician Tian He: http://chem.security.edu.cn/2014/1113/c6655a50029/page.htm communication author of academician Tian He: profile of Professor Ma Yu: http://chem.security.edu.cn/2014/1127/c665a50451/page.htm Professor Ma Yu