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在有机薄膜上制备EL器件,因能够制成大面积光发射显示器,所以受到人们的充分注意。在这种器件中,发射层内的空穴与电子复合,而后激发发射层而产生电致发光。Tang等人首先报导了用空穴输运层来实现空穴由电极到发射层的注入,采用此种方法可明显地将驱动电压降至儿伏。他们所报导的器件是由具有空穴输运层和发光金属络台物,Alq_3的双层结构组成的。在此种情况下,空穴输运层在空穴输运和阻挡电子方面起着重要的作用,这样可防止电子移向电极而与空穴复合。具有体积庞大的取代基
The preparation of an EL device on an organic thin film has attracted a great deal of attention due to its ability to produce a large-area light-emitting display. In this device, the holes in the emissive layer recombine with the electrons, and then the emissive layer is excited to generate electroluminescence. Tang et al. First reported the injection of holes from the electrode to the emissive layer using a hole transport layer, which significantly reduced the driving voltage to a few volts. The devices they reported are composed of a double-layer structure with a hole transport layer and a luminescent metal network, Alq_3. In this case, the hole transport layer plays an important role in transporting holes and blocking electrons, thus preventing electrons from migrating to the electrodes to recombine with holes. With bulky substituents