Synthesis And Photophysics Of2-Substituted-8-Hydroxyquinoline Metal Complexes

Organic Light Emitting Diode (OLED) materials have become research focus in scientific community and industrial circles, which offer large-area and wide-angle perspective, fast response, high luminous intensity and efficiency through simple and low-cost processing. In current, though research about OLED have made great progress, researchers have to work hard on the design and synthesis of new materials and mechanism research to further improve the performance of devices.Combining the blue with yellow light to achieve white light emission is an important method for the preparation of white OLED. Comparied to the red, green and blue color light-emitting device, it need less material and has a higher effiency. Therefore, the development of yellow OLED becomes a research focus.8-hydroxyquinoline metal complexes have highly thermal stability and luminescent properties. They are excellent electron-transporting materials and luminescent materials. In this article we can modify the ligand by means of proper chemical modification to change electron-withdrawing or electronic properties of2-substituted groups. It also can change the energy gap between HOMO and LUMO with lowest unoccupied molecular orbital of by quinoline complexes. This stage can change the jumping speed, transformation speed, emission decay speed in excited state, therefore luminescence properties are changed.Eleven new8-hydroxyquinoline derivatives with F, CF3, NO2or Cl and theircorresponding zinc complexes have been designed, synthesized and identified by HNMR, FFIR, MS spectra and elemental analyses, at the same time we obtain two intermediatecompounds of single crystalstructure. Physical properties have been determined by TGA and melting point test. The aggregation behavior of Zn(AcO)2and the ligands in solution was investigated by UV-vis. The luminescence properties of the compounds were investigated by UV-vis and fluorescence spectra at room temperature. The comparative study of the luminescent properties showed that the luminescent Properties can be tuned by different groups and the positions of benzene. Blue and yellow fluorescence materials were obtained as expected results.