Electronic processes in conjugated polymers

In this chapter we have drawn together the effects of electron-electron and electron-phonon coupling as a function of parameter space. In Chapter 10 we consider the specific physical example of frans-polyacetylene, while in Chapter 11 we focus on the phenyl-based light emitting polymers. The next two chapters describe how electron-lattice relaxation plays a key role in determining the optical and electronic processes in conjugated polymers. 

C.J. Brabec, G. Zerza, G. Cerullo, S. De Silvestri, S. Luzzati, J.C. Hummelen, and S. Sariciftci, Tracing photoinduced electron transfer process in conjugated polymer/fuUerene bulk hetero-junctions in real time, Chem. Phys. Lett., 340, 232-236 (2001). 

J.P. Pouget in Electronic Processes of Conjugated Polymers and Related Compounds, Eds., H. Kuzmany, M. Mehring and S. Roth, Springer, Heidelberg, 1985, 26. 

Friend, R.H., et al. 1997. Electronic processes of conjugated polymers in semiconductor devices. 

Voss, K.R, et al. 1991. Enhanced order and electronic delocalization in conjugated polymers oriented by gel processing in polyethylene. Phys Rev B 43 5109. 

How does the type and character of the electronic states determine the electronic and optical processes in conjugated polymers For example,... 

Szarko JM, Rolczynski BS, Guo J, Liang Y, He F, Mara MW, Yu L, Chen LX (2010) Electronic processes in conjugated diblock oligomers mimicking low band-gap polymers experimental and theoretical spectral analysis. J Phys Chem B 114 14505... 

Brabec CJ, Zerza G, Cerullo G, De Silvestii S, Luzzati S, Hummelen JC, Sariciftci S (2001) Tracing photoinduced electron transfer process in conjugated polymer/fullerene bulk heterojunctions in real time. Chem Phys Lett 340 232... 

Up to now we have considered the CP film as an amorphous, homogeneous and isotropic medium. However, CPs are intrinsically anisotropic since the 7r-electrons are delocalized along the macromolecule backbone. An anisotropic optical response, typical of oriented samples, is extremely important both for fundamental science (e.g., comparison with theoretical predictions) and for technological reasons (polarized emission is recommended in displays [55,56]). The orientation process for conjugated polymers is very difficult and several approaches have been used to remove the typical random-coil conformation of CP and to induce the extended aligned conformation. It is not the aim of this article to review all orientational techniques used with CPs. However, it should be mentioned that very high degrees of orientation have been achieved... 

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