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合成了一种纯度较高的1,5-萘二胺衍生物NPN,制备了NPN薄膜。利用紫外/可见吸收光谱和荧光发射光谱研究了NPN的发光行为,并结合电化学循环伏安法研究了其电子能级结构。差热扫描法(DSC)测定其玻璃化温度(Tg)高达129.7℃,熔点达245.7℃。结果表明,NPN薄膜在365nm紫外光的激发下,产生发光峰在448.6nm附近、谱线带宽为72.6nm的蓝光发射,发光亮度高,色纯度高。NPN的HOMO能级为-5.74eV,光学禁带约为2.79eV。NPN具有良好的热稳定性和给电子性,有望成为优良的空穴传输材料,也期望通过设计合理的器件结构实现电致蓝光发射。
A high purity 1,5-naphthalenediamine derivative NPN was synthesized and a NPN thin film was prepared. The luminescence behavior of NPN was studied by UV / Vis absorption and fluorescence emission spectroscopy, and its electron energy level structure was studied by electrochemical cyclic voltammetry. Differential scanning calorimetry (DSC) measured the glass transition temperature (Tg) as high as 129.7 ℃, melting point of 245.7 ℃. The results show that the NPN thin film emits blue light with a band width of 72.6 nm at a luminescence peak near 448.6 nm under the excitation of 365 nm ultraviolet light, with high luminescence brightness and high color purity. The HOMO energy level of NPN is -5.74eV and the optical band gap is about 2.79eV. NPN has good thermal stability and electron donating properties. It is expected to be an excellent hole-transporting material. It is also expected to achieve the blue-emitting of blue by designing a reasonable device structure.