Study Of The Reverse Polarization In The Organic Conjugated Polymers

The organic conjugate polymer takes one kind of new Functional Materials, namely has the metal and semiconductor's electronic nature, also has the polymer easily to process, to have the flexible mechanical characteristic, became recent years's research hot spot. To has the univariate characteristic polymer member structure and the characteristic, specially its unique electromagnetism light characteristic, may say that already had a quite thorough understanding. In regardless of the theory work embarks from the quantification or the physical modeling, obtained with the experiment basic consistent result.The organic polymer material may have misalignment Yuan stimulation and so on an orphan, polaron, exciton and double exciton through the doping or the electro-optical induction, this is the organic semiconductor and the traditional inorganic semiconductor's basic difference is. What exciton or double exciton condition correspondence is the neutral excited state, therefore in the organic component the electric charge transmission's current carrier is mainly the orphan, the polaron and the double-pole beggar, and these three kind of Yuan stimulations correspond in the different electric charge - - spinning relations (only then neutral orphan and belt single electric charge polaron carry 1/2 spinning). In the thorough understanding polymer each kind of Yuan stimulation regarding the research polymer's function characteristic, and has the very vital significance in the electro-optical aspect's widespread application.The so-called reverse polarization, i.e. the molecular dipole moment's direction and outside the electric field direction is opposite. In the report pointed out that accepts in atomic excited state - Ryder condition to have negative polarizability. Recently, Fudan University's Professor Sun Xin had pointed out that in the organic conjugate polymer the double exciton condition might have the reverse polarized characteristic similarly, and to its machine-made and possible to serve as the profound physical analysis. Must understand that in material reverse polarized phenomenon, we must analyze from the quantum mechanics angle. In the classical physics, the electron has a specific position in any time, in the electrical field intensity direct action and causes its movement. This means that electronic the movement decided by the electric field. But in the quantum mechanics, the electronic state describes by the wave function, the wave function is describes the molecular Hamilton's eigenstate, the polarization is the wave function change which the electric field causes.Reverse polarization are a new phenomenon in polymers. Inter-chain coupling of Solid polymer material has a greater influence to reverse polarization in two-exciton state. It can have a great increase to characteristics of the reverse polarization by increasing the degree of polymerization between Polymer molecules. It can achive the reverse polarization by Single-photon excitation of charged oligomers of molecular and so that it reduces the difficulty of the realization to reverse polarization. We find that reverse polarization behavior of charged oligomer molecules are closely related to molecular size and oligomer molecules can maintain the characteristics of reverse polarization only in the framework of certain size and there are existence of conjugate and critical length with a maximum reverse polarization.The system ofreverse polarization has always been exist in spite of not very strong interactions between electron. In addition, we also point out that reverse polarization of the charged oligomer molecules show clear signs of non-linear behavior With the electric field changes. Finally, we propose by discussing the effects of inter-chain coupling and degeneracy breaking parameters to reverse polarization that It can realize reverse polarization by single-molecule photon excitation of charged oligomers in experiment and at the same time the best samples of solid materials are selected and closed role of oligomer molecules is minimized.