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合成了一种新型的有机电致发光材料水杨醛缩乙二胺锌[Zn(salen)],并对其结构与性能进行了表征。Zn(salen)具有较高的热稳定性,利用真空热蒸镀的方法很容易制备高质量、无定型薄膜。Zn(salen)的HOMO、LUMO能级及电化学带隙分别为-5.87, -3.41,2.46 eV。在365 nm紫外光的照射下,Zn(salen)粉体具有强的蓝光发射,但其薄膜具有黄光发射。在正向电压的驱动下,器件ITO/CuPc/NPD/Zn(salen) /Al的EL发光峰位于552 nm,是色坐标为x=0.504,y=0.316的黄光发射,器件的启动电压7.5 V,最大亮度301cd/m2,电流效率1.6 cd/A。无论是Zn(salen)薄膜的光致发光还是器件的电致发光,与Zn(salen)粉体相比,都发生了很大的红移现象,这归因于薄膜中Zn(salen)聚集态的形成。
A novel organic electroluminescent material, Zn (salen), was synthesized and its structure and properties were characterized. Zn (salen) has high thermal stability, the use of vacuum thermal evaporation method is easy to prepare high-quality, amorphous film. The HOMO, LUMO energy levels and electrochemical bandgaps of Zn (salen) were -5.87, -3.41 and 2.46 eV, respectively. Zn (salen) powders have strong blue emission at 365 nm UV light, but their films have yellow emission. The EL emission peak of ITO / CuPc / NPD / Zn (salen) / Al is 552 nm under the forward voltage. It is the yellow emission with color coordinate x = 0.504 and y = 0.316. The starting voltage of the device is 7.5 V, the maximum brightness of 301cd / m2, the current efficiency of 1.6 cd / A. Both the photoluminescence of the Zn (salen) thin films and the electroluminescence of the devices show a large red shift compared with the Zn (salen) powders due to the Zn (salen) aggregation state Formation.