The polarization characteristics of electroluminescent polymers were studied with the theoretical model including the external field, electron-electron and electron-lattice interactions simultaneously. It was discovered that on-site Hubbard energy and the nearest neighbor electron-electron interactions increase the negative polarization of self-trapping bi-excitons in polymers obviously. The physical significance of negative polarization-a new phenomenon, and its possible applications were also explored.%用同时计入电子-电子相互作用,外电场及电子-晶格相互作用的理论模型研究分析了电致发光高分子的极化特性,发现在位电子相互作用和相邻格点间电子的相互作用明显增加高分子中双激子态的反向极化.本文还探讨了反向极化这个新的物理现象的意义及其可能的应用.
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