| The study on Organic electroluminescence devices(OELDs) have become one of the fascinating fields recently. Compared with inorganic electroluminescence devices, OELDs possess excellent features such as high efficiency, high brightness, rich color, wide visual view, low energy consumption, fast response, low cost, low-voltage driving matching integrate circuit, large-area full-color display, excellent mechanical properties and so on. As the foundation of OLEDs, organic electroluminescent (OEL) materials are one of the key factors influencing the device performance. Therefore, organic electroluminescent (OEL) materials are also one of chemists' hot subjects in this field. At present, OELDs have made great progress and developed for practicality and commodity, but their properties still be in the need of improvement in brightness, efficiency, lifetime, etc.As the study of hole-transporting and electroluminescent materials, some carbazole derivatives, including both low molecular weight compounds and polymers, play an important role in organic electroluminescent materials and devices. Polymers containing carbazole rings in the main chain or side chain have attracted much attention because of their unique photophysical properties. For example, poly(N-vinylcarbazole) containing carbazole rings in the side chain, as a kind of typical photoconductor, is widely appled to hole-transporting materials and used as hole-transporting layers in electroluminescent devices; the conjugated copolymer PCO containing carbazole rings in the main chain shows good thermal stability, low driving voltage and high glasstransition temperature and it exhibits greenish-blue light in organic electroluminescence devices. On the other hand, new small molecular compounds containing carbazole rings have been reported to be related to organic electroluminescent materials. But so far, the study on low molecular weight compounds containing two carbazole rings is not enough relatively reported by literatures.
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