中文摘要：

利用紫外-可见吸收光谱和电化学方法表征了三个系列新型的1，3，4-噁二唑类化合物的能级结构．设计并制备了以噁二唑衍生物与MEH—PPV的共混物作为发光层的电致发光器件（LED），比较了不同结构咏二唑引人发光层后对器件性能的影响．研究结果表明，以共混物为发光层的LED，其最大亮度可达到11810cd／m^2（8．5V），最大流明效率为1．1cd／A．与纯MEH—PPV单层发光器件相比，最大亮度提高了约40倍．结果表明，嘿二唑类衍生物具有优良的电子传输特性，将其引入发光层能有效地提高LED的性能．

英文摘要：

The energy levels, band gaps of new oxadiazole derivatives with different lengths of alkyl chain attached either lateral or terminal to the central phenylene ring were obtained based on the results of CV and UV-Vis spectroscopy. HOMO energy levels （-5.75-6.20 eV） of the alkoxyl-substituted derivatives are much higher than that of the unsubstituted one, especially the one with lateral alkyoxyl groups. In contrast, the LUMO energy levels are in the range of - 2.78 -- 2. 89 eV. The quasi-reversible redox behavior of the compounds indicates that they could be used as an active material for a light-emitting device. The light-emitting device using blends of MEH-PPV and the derivatives as emissive layers with brightness up to 11810 cd/m^2 （8.5 V）, 40 times brighter than that with MEH-PPV was fabricated. The result of the devices suggests that oxadiazole derivatives studied can be used as the electron-transporting materials and thus to enhance the efficiency of LEDs