Effects of electron-electron interactions on the polarization characteristics of electroluminescent polymers

The polarization characteristics of electroluminescent polymers were studie d with the theoretical model including the external field, electron-electro n and electron-lattice interactions simultaneously. It was discovered that on-site Hubbard energy and the nearest neighbor electron-electron interacti ons increase the negative polarization of self-trapping bi-excitons in poly mers obviously. The physical significance of negative polarization-a new ph enomenon, and its possible applications were also explored.