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合成了9种未曾公开发表过的有机小分子电致发光材料,都是Alq3的衍生物。为了阐明其发光特性,能带结构参数的测量十分必要。报道了利用电化学循环伏安法,测量这些发光材料的电化学氧化作用电位(Φp)和还原作用电位(Φn);进而由Φp和Φn起点电位值分别测算了这些材料的最高占有轨道(HOMO)能级,最低空轨道(LUMO)能级和电化学能隙(Eg)。电化学能隙和光学吸收方法测量的光学能隙符合得很好,其偏差在允许范围之内。这表明循环伏安法测量这些有机小分子电致发光材料的HOMO、LUMO能级和Eg的准确性和可行性。这9种Alq3衍生物材料具有较高的发光效率,很好的可溶性,可加工性和稳定性。其离化电位较高,不但可以作为很好的发光材料,而且还可以作为很好的电子传输材料。采用这些材料及其能带结构参数,可以设计和研制新型有机电致发光器件。
Nine kinds of organic small molecule electroluminescent materials that have not been published yet have been synthesized, all of which are derivatives of Alq3. In order to clarify its luminous characteristics, band structure parameters of the measurement is necessary. The electrochemical oxidation potentials (Φp) and reduction potentials (Φn) of these luminescent materials were reported by electrochemical cyclic voltammetry. The highest occupied orbital (HOMO) of these materials was measured by Φp and Φn starting potential values, respectively ) Energy level, the lowest LUMO energy level and the electrochemical energy gap (Eg). The optical energy gap measured by the electrochemical energy gap and the optical absorption method is in good agreement with the deviation within the allowable range. This shows that the cyclic voltammetry of these organic small molecule electroluminescent material HOMO, LUMO level and Eg accuracy and feasibility. The nine Alq3 derivative materials have high luminous efficiency, good solubility, workability and stability. Its ionization potential higher, not only can be used as a good luminescent material, but also can be used as a good electron transport material. Using these materials and their band structure parameters, new organic electroluminescent devices can be designed and developed.