Babudri Francesco, Farinola Gianluca M, Naso Francesco, Ragni Roberta
Dipartimento di Chimica, Università degli Studi, via Orabona, 4 I-70126 Bari, Italy.
Chem Commun (Camb). 2007 Mar 14(10):1003-22. doi: 10.1039/b611336b. Epub 2006 Dec 4.
In this article we highlight, by means of selected examples drawn from work performed in our or other laboratories, the features of some classes of fluorinated conjugated materials and their use in electronic devices such as electroluminescent diodes or field effect transistors. A variety of fluorinated conjugated systems, either molecular or polymeric, such as poly(phenylenevinylene)s, poly(phenyleneethynylene)s, polythiophenes, polyphenylenes, are dealt with. Attention is also focused on a different class of electroluminescent compounds, represented by the cyclometalated iridium complexes with various forms (mer and fac). In particular, fluorine atoms lower both the HOMO and LUMO energy levels. Consequently, the electron injection is made easier, the materials display a greater resistance against the degradative oxidation processes and organic n-type or ambipolar semiconducting materials may result. Moreover, the C-H...F interactions play an important role in the solid state supramolecular organization, originating a typical pi-stack arrangement which enhances the charge carrier mobility.
在本文中，我们通过从我们实验室或其他实验室所开展工作中选取的实例，重点介绍了某些类别的氟化共轭材料的特性，以及它们在诸如电致发光二极管或场效应晶体管等电子器件中的应用。文中讨论了多种氟化共轭体系，包括分子型和聚合物型，如聚对苯撑乙烯、聚对苯撑乙炔、聚噻吩、聚亚苯基等。同时，注意力也集中在另一类以各种形式（面式和 meridional 式）的环金属化铱配合物为代表的电致发光化合物上。特别地，氟原子降低了最高占据分子轨道（HOMO）和最低未占据分子轨道（LUMO）的能级。因此，电子注入变得更容易，材料对降解氧化过程表现出更大的抗性，并且可能产生有机 n 型或双极性半导体材料。此外，C-H...F 相互作用在固态超分子组织中起着重要作用，形成一种典型的π-堆积排列，从而提高了电荷载流子迁移率。
