Study Of The Novel Aza Organic Electron Materials

Recently there has been significant interest in electroluminescence from organic materials. Driven by the potential to significantly impact the information display market, research and development on organic light emitting devices (OLEDs) has advanced at a remarkable pace over the past decade. Efficient organic electroluminescence (EL) was first reported in 1987 by Tang and his coworkers of Kodak. Further attention was gained when Friend and coworkers at Cambridge University demonstrated the efficient EL based on the polymer film with the solution process in 2000. The emergence of new materials allow the use of these materials for OLEDs.Organic EL devices, or organic light-emitting diodes, are main composed of emission materials, hole-transporting materials and electron-transporting materials. A number of emission materials and hole-transporting materials were reported. In contrast, materials for electron-transporting materials are few. The typical electron-transporting material 8-hydroxyquinoline aluminum (Alq) containing oxygen atom is prone to form hydrogen bond. Lifetime of the device fabricated by Alq is short for the oxygen atoms of Alq.To tide over the shortage of Alq, we enlarge the low-molecule and high-molecule compounds with the aza-aromaticring structure as electron-transporting materials to find out the synthetical law of these compounds for improving performance of electron-transporting materials. We also study the mechanism of electron transport in the hope of get some innovation in novel electron-transporting materials fields.We synthesized and characterized non-oxygen aza compounds, such as pyridine-containing hydrazine compounds , quinoxaline compounds and TMCDs compounds. The FT-IR, mass spectrum, UV-visible absorbation spectrum, thermal prformances, electrochemical property and ionization potential (Ip) of these compounds were determined. Then, the OLEDs using these compounds were fabricated. and, the EL spectrum, luminance-voltage characteristics and current density-voltage characteristics of the devices were determined.We got some compounds with physical and chemical stability, showing high electron-transporting performance. These compounds were also found to be useful as the electron-transporting materials in organic electroluminescent devices.