1,5-萘二胺衍生物的光谱分析及发光性能研究

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.结果表明,NPN的荧光光谱表现出明显的溶剂效应,认为其发生了从电子给体N原子到电子受体芳环之间的分子内电子转移,形成分子内电子转移络合物;从NPN薄膜与其溶液的吸收光谱峰值比较中看出吸收峰红移,认为薄膜中分子形成"J-聚集体";NPN的HOMO能级为-5.74 eV,光学禁带为2.79 eV;在365 nm紫外光的激发下,产生发光峰在448.6 nm附近、谱线带宽为72.6 nm的蓝光发射,发光亮度高,色纯度高.

Spectral Analysis and Photoluminescence Properties of 1,5-Naphthalene Diamine Derivative

In the present paper,1,5-bisN-(1-naphthyl)-N-phenyl] naphthalene diamine(NPN) with high purity was synthesized by liquid-phase Ullmann reaction,and high quality film of NPN was formed on cleaned glass substrates by vacuum evaporation.Photoluminescence properties were studied by solvent effects on UV-Vis absorption spectra and fluorescence spectra.In addition the structure of energy band of NPN was studied by cyclic voltammetry,UV-Vis absorption spectra,and fluorescence spectra.The results indicate that the fluorescence emitting is attributed to the charge transfer transition from nitrogen to aromatic ring.The molecules of NPN in its film form "J-aggregate".The HOMO energy and optical gap of NPN are-5.74 and 2.79 eV(respectively.) NPN film could emit intense blue fluorescence with a peak wavelength at 448.6 nm and a bandwidth of 72.6 nm under UV-Vis excitation at 365 nm.