Ladder-Type Poly-p-Phenylenes

E.J.W. List, L. Holzer, S. Tasch, G. Leising, M. Catellani, and S. Luzzati, Efficient, single layer yellow light emitting diodes made of a blend of a ladder-type poly(p-phenylene) and polyalkylthio-phene, Opt. Mater., 12 311-314, 1999. 

L. Romaner, G. Heimel, H. Weisenhofer, P.S. de Freitas, U. Scherf, J.-L. Bredas, E. Zojer, and E.J.W. List, Ketonic defects in ladder-type poly(p-phenylene)s, Chem. Mater., 16 4667-4674, 2004. 

S. Tasch, A. Niko, G. Leising, and U. Scherf, Highly efficient electroluminescence of new wide band gap ladder-type poly(p-phenylenes), Appl. Phys. Lett., 68 1090-1092, 1996. 

G. Leising, S. Tasch, F. Meghdadi, L. Athouel, G. Froyer, and U. Scherf, Blue electroluminescence with ladder-type poly(p-phenylene) and p-hexaphenyl, Synth. Met., 81 185-189, 1996. 

Prins P, Grozema FC, Schins JM, Savenije TJ, Patil S, Scherf U, Siebbeles LDA (2006) Effect of intermolecular disorder on the intrachain charge transport in ladder-type poly (p-phenylenes). Phys Rev B 73 045204... 

Polythiophene derivative Ladder-type poly(p-phenylene)... 

Figure 3.25. Two-photon excitation spectrum of ladder-type poly(p-phenylene) containing phenyl substituents measured in a 10 4 M solution in toluene in the spectral range between 690 and 900 nm (i.e., 1.47-1.79 eV) using an Ar+ ion laser pumped cw Ti sapphire laser that works in single TEM0o mode. (From Ref. [382] with permission of Wiley-VCH.)...

Since appropriate instruments have become commercially available, CD spectroscopy has developed into a routine method for the characterization of the chirality of newly synthesized polymers. As a typical example, the rather high chiro-optical activity of the ladder-type poly(p-phenylene) of the structure shown in Chart 1.11 was revealed CD spectroscopically molar ellipticity [6>] = 2.2x 10 rad cm mol (at 7max=461 nm), corresponding to an anisotropy factor of g = Ae/e = 0.003 [46]. 

It seems that m-LPPP, a ladder-type poly(p-phenylene), is one of the most promising materials for laser application. It is soluble in nonpolar organic solvents, thus enabling the facile preparation of thin layers on substrates that may possess structured uneven surfaces. 

Prins, P., Grozema, F.C., Schins, J.M., Patil, S., Scherf, U., and Siebbeles, L.D.A. (2006) High intrachain hole mobility on molecular wires of ladder type poly(p-phenylenes). Phys. Rev. Lett., 96, 146601. 

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