取代基对4-N,N-二苯胺基均二苯乙烯类电致发光材料光电特性的影响  

Influence of Substituents on the Properties of Photoelectricity in 4-N,N-Diphenylaminostilbene-like Electroluminescent Materials

作　　者：陈安尚[1] 李亚明[1] 张华[1] 

机构地区：[1]大连理工大学精细化工国家重点实验室,大连116012

出　　处：《化学学报》2005年第6期460-464,F006,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20076005)资助项目.

摘　　要：用紫外吸收光谱、荧光发射光谱、循环伏安法(CV)、微分脉冲伏安法(DPV)等手段研究了4个4-N,N-二苯胺基均二苯乙烯类化合物的光电性能,计算出它们的电离势(PI)在5.70～5.90eV,带隙值(Eg)在2.78～2.88eV,分析了电化学行为,讨论了取代基对吸收光谱、发射光谱和电子结构的影响.结果表明,引入供电子基团OCH3后,分子氧化电位降低,HOMO能量升高,电离势降低;引入吸电子基团—Cl后,氧化电位升高,LUMO能量降低,电子亲和势增加.取代基—Cl和—OCH3都使化合物的带隙(Eg)减小,紫外-可见光谱的吸收峰和荧光光谱的发射峰均发生红移.The photo-electricity of four 4-N,N-diphenylaminostilbene-like electroluminescent materials, which exhibit intense photoluminescence in CHCl3 with their emission maximal range from 435 nm to 465 nm, were studied by UV-vis spectra, photoluminescent spectra, cyclic voltammetry and differential pulse voltammetry. Their band gaps E-g and ionization potentials P-I calculated are 2.78 similar to 2.88 eV and 5.70 similar to 5.90 eV, respectively. The electrochemistry behavior was analyzed, and the relationship among photoluminescent property, electronic structure and different substituents was systematically discussed. The result indicates that while HOMO level of compound is raised by electron-donor (OCH3) group, the oxidative onset potentials and the ionization potentials are decreased, but while LUMO level is lowered by the electron-acceptor (-Cl) group, the oxidative onset potentials and electron affinities are increased. The band gap of the molecules is decreased in both cases, which results in the red shift of UV-Vis and photoluminescent spectra.

关 键 词：取代基 电离势 带隙 电子结构 基团 氧化电位 循环伏安法 升高 二苯乙烯类化合物 影响 

分 类 号：O625.6[理学—有机化学]