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Generation of Circularly Polarized Light of Highly Oriented Poly(P-Phenylene Vinylene)

Published online by Cambridge University Press:  21 March 2011

A. Marletta ,
D. Gonçalves ,
O. N. Oliveira Jr. ,
R. M. Faria  and
F. E. G. Guimarães
A. Marletta
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo, C.P. 369, 13560-970, São Carlos- SP, Brazil
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Abstract

Langmuir-Blodgett (LB) films of poly(p-phenylene vinylene) (PPV) were prepared using an amphiphilic precursor, where the counterion chloride was partially replaced by a long chain dodecylbenzenesulfonate ion. These LB-PPV films are highly ordered along the dipping direction as demonstrated by linear dichroism experiments using linearly polarized optical absorption and emission. The intensity ratio between emitted light parallel and perpendicular to the dipping direction was ca. 17, which is much higher than the dichroic ratio of 3.6 found in the polarized absorption experiment. These values indicate an efficient energy and/or charge transfer between low conjugated segments (disordered) and highly conjugated (ordered) ones after excitation. In addition, the LB films displayed large circular polarization with an asymmetry factor ge which varies from 0.6 to –0.2 when the sample temperature is increased from 30 to 300 K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 660: Symposia JJ – Organic Electronic & Photonic Materials and Devices , 2000 , JJ3.7
Copyright
Copyright © Materials Research Society 2001

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